| Abies concolor (Gordon & Glend.) Lindl. ex Hildebr. | 643 images |
| Abies lasiocarpa (Hook.) Nutt. | 171 images |
| Abronia angustifolia Greene | 7 images |
| Abronia bigelovii Heimerl | 2 images |
| Abronia fragrans Nutt. ex Hook. | 78 images |
| Abutilon abutiloides (Jacq.) Garcke ex Hochr. | 17 images |
| Abutilon hypoleucum A.Gray | 1 images |
| Abutilon incanum (Link) Sweet | 18 images |
| Abutilon theophrasti Medik. | 2914 images |
| Abutilon trisulcatum (Jacq.) Urb. | 5 images |
| Abutilon viscosum (L.) Dorr | 1 images |
| Acaciella angustissima (Mill.) Britton & Rose | 68 images |
| Acalypha monostachya Cav. | 25 images |
| Acalypha phleoides Cav. | 19 images |
| Acalypha poiretii Spreng. | 9 images |
| Acalypha radians Torr. | 5 images |
| Acalypha rhomboidea Raf. | 3 images |
| Acalypha virginica L. | 1019 images |
| Acanthocereus tetragonus (L.) Hummelinck | 2007 images |
| Acanthospermum australe (Loefl.) Kuntze | 94 images |
| Acer glabrum Torr. | 151 images |
| Acer grandidentatum Nutt. | 71 images |
| Acer negundo L. | 16500 images |
| Acer rubrum L. | 5989 images |
| Acer saccharum Marshall | 1807 images |
| Achillea millefolium L. | 25249 images |
| Achyranthes aspera L. | 904 images |
| Acleisanthes longiflora A.Gray | 7 images |
| Acleisanthes obtusa (Choisy) Standl. | 4 images |
| Acmispon americanus (Nutt.) Rydb. | 26 images |
| Aconitum columbianum Nutt. | 171 images |
| Acorus calamus L. | 660 images |
| Acourtia thurberi (A.Gray) Reveal & R.M.King | 8 images |
| Acourtia wrightii (A.Gray) Reveal & R.M.King | 1 images |
| Actaea rubra (Aiton) Willd. | 710 images |
| Adiantum capillus-veneris L. | 3121 images |
| Adonis annua L. | 863 images |
| Adoxa moschatellina L. | 770 images |
| Aegilops cylindrica Host | 59 images |
| Aeschynomene americana L. | 153 images |
| Aeschynomene indica L. | 46 images |
| Aesculus × bushii C.K.Schneid. | 14 images |
| Aesculus glabra Willd. | 932 images |
| Aesculus pavia L. | 1531 images |
| Agalinis calycina Pennell | 3 images |
| Agalinis edwardsiana Pennell | 11 images |
| Agalinis maritima (Raf.) Raf. | 6 images |
| Agalinis oligophylla Pennell | 2 images |
| Agalinis purpurea (L.) Pennell | 165 images |
| Agalinis tenuifolia (Vahl) Raf. | 101 images |
| Agastache breviflora (A.Gray) Epling | 2 images |
| Agastache nepetoides (L.) Kuntze | 64 images |
| Agastache rupestris (Greene) Standl. | 115 images |
| Agave americana L. | 8119 images |
| Agave asperrima Jacobi | 145 images |
| Agave havardiana Trel. | 68 images |
| Agave lechuguilla Torr. | 94 images |
| Agave lophantha Schiede | 221 images |
| Agave maculata Regel | 46 images |
| Agave palmeri Engelm. | 30 images |
| Agave parryi Engelm. | 431 images |
| Agave schottii Engelm. | 13 images |
| Agave variegata Jacobi | 6 images |
| Agave virginica L. | 54 images |
| Agave weberi J.F.Cels ex J.Poiss. | 13 images |
| Ageratina altissima (L.) R.M.King & H.Rob. | 1118 images |
| Ageratina havanensis (Kunth) R.M.King & H.Rob. | 11 images |
| Ageratina herbacea (A.Gray) R.M.King & H.Rob. | 17 images |
| Ageratina rothrockii (A.Gray) R.M.King & H.Rob. | 3 images |
| Ageratum corymbosum Zuccagni | 1 images |
| Ageratum houstonianum Mill. | 3144 images |
| Agoseris aurantiaca (Hook.) Greene | 46 images |
| Agoseris glauca (Pursh) Raf. | 33 images |
| Agoseris heterophylla (Nutt.) Greene | 45 images |
| Agrimonia eupatoria L. | 10802 images |
| Agrimonia gryposepala Wallr. | 318 images |
| Agrimonia pubescens Wallr. | 20 images |
| Agrimonia rostellata Wallr. | 29 images |
| Agrimonia striata Michx. | 18 images |
| Agropyron cristatum (L.) Gaertn. | 114 images |
| Agropyron desertorum (Fisch. ex Link) Schult. | 3 images |
| Agrostemma githago L. | 3972 images |
| Agrostis exarata Trin. | 11 images |
| Agrostis gigantea Roth | 141 images |
| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | 4 images |
| Agrostis perennans (Walter) Tuck. | 4 images |
| Agrostis scabra Willd. | 2 images |
| Agrostis stolonifera L. | 365 images |
| Agrostis variabilis Rydb. | 1 images |
| Ailanthus altissima (Mill.) Swingle | 11958 images |
| Aira elegans Willd. ex Roem. & Schult. | 63 images |
| Ajuga reptans L. | 21987 images |
| Albizia julibrissin Durazz. | 12815 images |
| Alcea rosea L. | 14569 images |
| Alchemilla australis (Rydb.) Bomble | 63 images |
| Alchemilla monticola Opiz | 715 images |
| Alchemilla vulgaris L. | 254 images |
| Aldama cordifolia (A.Gray) E.E.Schill. & Panero | 4 images |
| Aldama phenax (S.F.Blake) E.E.Schill. & Panero | 2 images |
| Aletris aurea Walter | 3 images |
| Aletris farinosa L. | 19 images |
| Alhagi graecorum Boiss. | 12 images |
| Alhagi maurorum Medik. | 112 images |
| Alisma gramineum Lej. | 25 images |
| Alisma subcordatum Raf. | 28 images |
| Alisma triviale Pursh | 35 images |
| Allenrolfea occidentalis (S.Watson) Kuntze | 28 images |
| Allionia choisyi Standl. | 9 images |
| Allionia incarnata L. | 145 images |
| Allium acuminatum Hook. | 56 images |
| Allium ampeloprasum L. | 6316 images |
| Allium bigelovii S.Watson | 2 images |
| Allium bisceptrum S.Watson | 20 images |
| Allium brevistylum S.Watson | 3 images |
| Allium canadense L. | 321 images |
| Allium cepa L. | 2409 images |
| Allium cernuum Roth | 235 images |
| Allium drummondii Regel | 55 images |
| Allium geyeri S.Watson | 3 images |
| Allium macropetalum Rydb. | 9 images |
| Allium stellatum Nutt. ex Ker Gawl. | 19 images |
| Alnus incana (L.) Moench | 2435 images |
| Alnus oblongifolia Torr. | 4 images |
| Alnus serrulata (Aiton) Willd. | 133 images |
| Aloe vera (L.) Burm.f. | 10457 images |
| Alopecurus aequalis Sobol. | 129 images |
| Alopecurus carolinianus Walter | 3 images |
| Alopecurus geniculatus L. | 120 images |
| Alopecurus myosuroides Huds. | 545 images |
| Alopecurus pratensis L. | 2846 images |
| Aloysia gratissima (Gillies & Hook.) Tronc. | 188 images |
| Aloysia macrostachya (Torr.) Moldenke | 9 images |
| Alternanthera bettzickiana (Regel) G.Nicholson | 793 images |
| Alternanthera caracasana Kunth | 134 images |
| Alternanthera paronychioides A.St.-Hil. | 57 images |
| Alternanthera philoxeroides (Mart.) Griseb. | 341 images |
| Alternanthera pungens Kunth | 148 images |
| Alysicarpus vaginalis (L.) DC. | 202 images |
| Alyssum alyssoides (L.) L. | 1099 images |
| Alyssum desertorum Stapf | 24 images |
| Alyssum simplex Rudolphi | 177 images |
| Amaranthus albus L. | 504 images |
| Amaranthus blitoides S.Watson | 501 images |
| Amaranthus blitum L. | 2237 images |
| Amaranthus californicus (Moq.) S.Watson | 12 images |
| Amaranthus crassipes Schltdl. | 2 images |
| Amaranthus cruentus L. | 1078 images |
| Amaranthus fimbriatus (Torr.) Benth. | 45 images |
| Amaranthus greggii S.Watson | 1 images |
| Amaranthus hybridus L. | 1413 images |
| Amaranthus hypochondriacus L. | 1214 images |
| Amaranthus palmeri S.Watson | 120 images |
| Amaranthus polygonoides L. | 18 images |
| Amaranthus powellii S.Watson | 83 images |
| Amaranthus retroflexus L. | 8318 images |
| Amaranthus spinosus L. | 1302 images |
| Amaranthus torreyi (A.Gray) Benth. ex S.Watson | 35 images |
| Amaranthus viridis L. | 1554 images |
| Amblyolepis setigera DC. | 31 images |
| Ambrosia acanthicarpa Hook. | 63 images |
| Ambrosia artemisiifolia L. | 4795 images |
| Ambrosia bidentata Michx. | 20 images |
| Ambrosia confertiflora DC. | 20 images |
| Ambrosia monogyra (Torr. & A.Gray) Strother & B.G.Baldwin | 2 images |
| Ambrosia psilostachya DC. | 362 images |
| Ambrosia trifida L. | 1008 images |
| Amelanchier alnifolia (Nutt.) Nutt. ex M.Roem. | 664 images |
| Amelanchier arborea (F.Michx.) Fernald | 34 images |
| Amelanchier utahensis Koehne | 73 images |
| Ammannia auriculata Willd. | 13 images |
| Ammannia coccinea Rottb. | 48 images |
| Ammannia grayi S.A.Graham & Gandhi | 4 images |
| Ammannia latifolia L. | 15 images |
| Ammannia robusta Heer & Regel | 5 images |
| Ammi majus L. | 1850 images |
| Amorpha canescens Pursh | 214 images |
| Amorpha fruticosa L. | 1997 images |
| Ampelopsis cordata Michx. | 371 images |
| Amphiachyris amoena (Shinners) Solbrig | 4 images |
| Amphiachyris dracunculoides (DC.) Nutt. | 96 images |
| Amphicarpaea bracteata (L.) Fernald | 426 images |
| Amsinckia menziesii (Lehm.) A.Nelson & J.F.Macbr. | 220 images |
| Amsonia ciliata Walter | 100 images |
| Amsonia longiflora Torr. | 20 images |
| Amsonia palmeri A.Gray | 6 images |
| Amsonia tabernaemontana Walter | 791 images |
| Amsonia tharpii Woodson | 2 images |
| Amsonia tomentosa Torr. & Frém. | 3 images |
| Anaphalis margaritacea (L.) Benth. & Hook.f. | 1296 images |
| Anchusa azurea Mill. | 3200 images |
| Andersonglossum virginianum (L.) J.I.Cohen | 254 images |
| Andropogon gerardi Vitman | 182 images |
| Andropogon gyrans Ashe | 9 images |
| Andropogon ternarius Michx. | 32 images |
| Andropogon virginicus L. | 3 images |
| Androsace occidentalis Pursh | 5 images |
| Androsace septentrionalis L. | 169 images |
| Androstephium breviflorum S.Watson | 7 images |
| Androstephium coeruleum (Scheele) Greene | 5 images |
| Anemia mexicana Klotzsch | 38 images |
| Anemonastrum canadense (L.) Mosyakin | 915 images |
| Anemone berlandieri Pritz. | 154 images |
| Anemone caroliniana Walter | 9 images |
| Anemone cylindrica A.Gray | 14 images |
| Anemone multifida Poir. | 106 images |
| Anemone tuberosa Rydb. | 15 images |
| Anemopsis californica (Nutt.) Hook. & Arn. | 105 images |
| Anethum graveolens L. | 2505 images |
| Angelica pinnata S.Watson | 2 images |
| Anisacanthus puberulus (Torr.) Henrickson & E.J.Lott | 1 images |
| Anisacanthus quadrifidus (Vahl) Nees | 48 images |
| Anisacanthus thurberi (Torr.) A.Gray | 15 images |
| Anoda cristata (L.) Schltdl. | 61 images |
| Anredera cordifolia (Ten.) Steenis | 988 images |
| Anredera vesicaria (Lam.) C.F.Gaertn. | 4 images |
| Antennaria marginata Greene | 1 images |
| Antennaria media Greene | 9 images |
| Antennaria microphylla Rydb. | 5 images |
| Antennaria parlinii Fernald | 24 images |
| Antennaria parvifolia Nutt. | 88 images |
| Antennaria rosea Greene | 2 images |
| Anthemis cotula L. | 1548 images |
| Anthoxanthum aristatum Boiss. | 55 images |
| Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp | 73 images |
| Anthoxanthum odoratum L. | 2310 images |
| Anticlea elegans (Pursh) Rydb. | 42 images |
| Antigonon leptopus Hook. & Arn. | 1420 images |
| Anulocaulis leiosolenus (Torr.) Standl. | 3 images |
| Apera interrupta (L.) P.Beauv. | 31 images |
| Apera spica-venti (L.) P.Beauv. | 69 images |
| Aphanostephus pilosus Buckley | 4 images |
| Aphanostephus ramosissimus DC. | 37 images |
| Apios americana Medik. | 299 images |
| Apium graveolens L. | 1922 images |
| Apocynum androsaemifolium L. | 1008 images |
| Apocynum cannabinum L. | 922 images |
| Apteria aphylla (Nutt.) Barnhart ex Small | 3 images |
| Aquarius cordifolius (L.) Christenh. & Byng | 89 images |
| Aquilegia canadensis L. | 1971 images |
| Aquilegia chrysantha A.Gray | 69 images |
| Aquilegia coerulea E.James | 5 images |
| Aquilegia desertorum (M.E.Jones) Cockerell ex A.Heller | 24 images |
| Aquilegia elegantula Greene | 11 images |
| Arabidopsis thaliana (L.) Heynh. | 2118 images |
| Arabis hirsuta (L.) Scop. | 1525 images |
| Aralia humilis Cav. | 4 images |
| Aralia spinosa L. | 428 images |
| Arbutus xalapensis Kunth | 130 images |
| Arceuthobium campylopodum Engelm. | 33 images |
| Arceuthobium divaricatum Engelm. | 1 images |
| Arceuthobium douglasii Engelm. | 4 images |
| Arctium minus (Hill) Bernh. | 11374 images |
| Arctostaphylos patula Greene | 106 images |
| Arctostaphylos pungens Kunth | 128 images |
| Arctostaphylos uva-ursi (L.) Spreng. | 2031 images |
| Ardisia crenata Sims | 986 images |
| Ardisia japonica (Thunb.) Blume | 11 images |
| Arenaria benthamii Fenzl ex Torr. & A.Gray | 1 images |
| Arenaria lanuginosa (Michx.) Rohrb. | 8 images |
| Arenaria serpyllifolia L. | 1416 images |
| Argemone albiflora Hornem. | 227 images |
| Argemone mexicana L. | 1109 images |
| Argemone pleiacantha Greene | 54 images |
| Argemone polyanthemos (Fedde) Ownbey | 9 images |
| Argemone sanguinea Greene | 10 images |
| Argemone squarrosa Greene | 5 images |
| Argentina anserina (L.) Rydb. | 4914 images |
| Ariocarpus fissuratus (Engelm.) K.Schum. | 64 images |
| Arisaema dracontium (L.) Schott | 347 images |
| Arisaema triphyllum (L.) Schott | 2086 images |
| Aristida adscensionis L. | 129 images |
| Aristida purpurea Nutt. | 7 images |
| Aristida spiciformis Elliott | 1 images |
| Aristida ternipes Cav. | 10 images |
| Aristolochia coryi I.M.Johnst. | 9 images |
| Aristolochia erecta L. | 2 images |
| Aristolochia serpentaria L. | 19 images |
| Aristolochia tomentosa Sims | 84 images |
| Aristolochia watsonii Wooton & Standl. | 14 images |
| Aristolochia wrightii Seem. | 11 images |
| Armoracia rusticana G.Gaertn., B.Mey. & Scherb. | 273 images |
| Arnica chamissonis Less. | 83 images |
| Arnica cordifolia Hook. | 209 images |
| Arnoglossum ovatum (Walter) H.Rob. | 1 images |
| Arnoglossum plantagineum Raf. | 50 images |
| Aronia arbutifolia (L.) Pers. | 158 images |
| Arrhenatherum elatius (L.) P.Beauv. ex J.Presl & C.Presl | 2099 images |
| Artemisia annua L. | 3489 images |
| Artemisia biennis Willd. | 137 images |
| Artemisia campestris L. | 1660 images |
| Artemisia cana Pursh | 31 images |
| Artemisia dracunculus L. | 2305 images |
| Artemisia filifolia Torr. | 29 images |
| Artemisia frigida Willd. | 112 images |
| Artemisia laciniata Willd. | 1 images |
| Artemisia ludoviciana Nutt. | 1141 images |
| Artemisia nova A.Nelson | 4 images |
| Artemisia spinescens D.C.Eaton | 1 images |
| Artemisia tridentata Nutt. | 341 images |
| Arthraxon hispidus (Thunb.) Makino | 44 images |
| Arundinaria gigantea (Walter) Muhl. | 194 images |
| Arundo donax L. | 2996 images |
| Asclepias amplexicaulis Sm. | 54 images |
| Asclepias arenaria Torr. | 15 images |
| Asclepias asperula (Decne.) Woodson | 441 images |
| Asclepias brachystephana Engelm. ex Torr. | 20 images |
| Asclepias curassavica L. | 2543 images |
| Asclepias emoryi (Greene) Vail | 9 images |
| Asclepias engelmanniana Woodson | 8 images |
| Asclepias hallii A.Gray | 10 images |
| Asclepias incarnata L. | 1114 images |
| Asclepias involucrata Engelm. ex Torr. | 2 images |
| Asclepias lanceolata Walter | 7 images |
| Asclepias latifolia (Torr.) Raf. | 126 images |
| Asclepias linaria Cav. | 82 images |
| Asclepias linearis Scheele | 16 images |
| Asclepias longifolia Michx. | 17 images |
| Asclepias macrotis Torr. | 5 images |
| Asclepias nummularia Torr. | 2 images |
| Asclepias nyctaginifolia A.Gray | 1 images |
| Asclepias obovata Elliott | 2 images |
| Asclepias perennis Walter | 44 images |
| Asclepias prostrata W.H.Blackw. | 3 images |
| Asclepias pumila (A.Gray) Vail | 6 images |
| Asclepias purpurascens L. | 555 images |
| Asclepias rubra L. | 9 images |
| Asclepias speciosa Torr. | 698 images |
| Asclepias stenophylla A.Gray | 20 images |
| Asclepias subverticillata (A.Gray) Vail | 16 images |
| Asclepias syriaca L. | 3636 images |
| Asclepias texana A.Heller | 22 images |
| Asclepias tomentosa Elliott | 8 images |
| Asclepias tuberosa L. | 2246 images |
| Asclepias uncialis Greene | 2 images |
| Asclepias variegata L. | 143 images |
| Asclepias verticillata L. | 186 images |
| Asclepias viridiflora Raf. | 212 images |
| Asclepias viridis Walter | 523 images |
| Asimina parviflora (Michx.) Dunal | 45 images |
| Asimina triloba (L.) Dunal | 1417 images |
| Asparagus officinalis L. | 3114 images |
| Asphodelus fistulosus L. | 2741 images |
| Asplenium platyneuron (L.) Britton, Sterns & Poggenb. | 355 images |
| Asplenium resiliens Kunze | 11 images |
| Asplenium scolopendrium L. | 6212 images |
| Asplenium septentrionale (L.) Hoffm. | 399 images |
| Asplenium trichomanes L. | 5927 images |
| Astragalus alpinus L. | 340 images |
| Astragalus canadensis L. | 45 images |
| Astragalus cicer L. | 340 images |
| Astragalus crassicarpus Nutt. | 69 images |
| Astragalus lindheimeri Engelm. ex A.Gray | 1 images |
| Astragalus lotiflorus Hook. | 7 images |
| Astragalus missouriensis Nutt. | 42 images |
| Astragalus mollissimus Torr. | 58 images |
| Astragalus nuttallianus DC. | 17 images |
| Astragalus racemosus Pursh | 22 images |
| Astragalus siliceus Barneby | 1 images |
| Astragalus tenellus Pursh | 5 images |
| Astrophytum asterias (Zucc.) Lem. | 282 images |
| Athyrium filix-femina (L.) Roth | 3723 images |
| Atriplex argentea Nutt. | 3 images |
| Atriplex canescens (Pursh) Nutt. | 158 images |
| Atriplex hortensis L. | 1062 images |
| Atriplex lentiformis (Torr.) S.Watson | 12 images |
| Atriplex micrantha Ledeb. | 66 images |
| Atriplex obovata Moq. | 5 images |
| Atriplex prostrata Boucher ex DC. | 1310 images |
| Atriplex rosea L. | 39 images |
| Atriplex semibaccata R.Br. | 101 images |
| Aureolaria flava (L.) Farw. | 51 images |
| Aureolaria grandiflora (Benth.) Pennell | 53 images |
| Aureolaria pectinata (Nutt.) Pennell | 29 images |
| Aureolaria virginica (L.) Pennell | 37 images |
| Avena barbata Pott ex Link | 1275 images |
| Avena fatua L. | 2604 images |
| Avena sativa L. | 3720 images |
| Avenella flexuosa (L.) Drejer | 445 images |
| Avicennia germinans (L.) L. | 432 images |
| Axonopus compressus (Sw.) P.Beauv. | 214 images |
| Axonopus fissifolius (Raddi) Kuhlm. | 345 images |
| Azolla caroliniana Willd. | 14 images |
| Azolla filiculoides Lam. | 359 images |
| Baccharis halimifolia L. | 1572 images |
| Baccharis neglecta Britton | 93 images |
| Baccharis pilularis DC. | 709 images |
| Baccharis salicifolia (Ruiz & Pav.) Pers. | 26 images |
| Baccharis salicina Torr. & A.Gray | 23 images |
| Baccharis sarothroides A.Gray | 49 images |
| Bacopa caroliniana (Walter) B.L.Rob. | 10 images |
| Bacopa monnieri (L.) Wettst. | 197 images |
| Bacopa repens (Sw.) Wettst. | 134 images |
| Bacopa rotundifolia (Michx.) Wettst. | 6 images |
| Baileya multiradiata Harv. & A.Gray | 54 images |
| Baptisia alba (L.) R.Br. | 123 images |
| Baptisia australis (L.) R.Br. | 1106 images |
| Baptisia nuttalliana Small | 48 images |
| Baptisia sphaerocarpa Nutt. | 167 images |
| Barbarea orthoceras Ledeb. | 548 images |
| Barbarea vulgaris W.T.Aiton | 1165 images |
| Bartonia verna (Michx.) Raf. ex Barton | 2 images |
| Bassia hyssopifolia (Pall.) Kuntze | 36 images |
| Bassia prostrata (L.) Beck | 110 images |
| Bassia scoparia (L.) A.J.Scott | 406 images |
| Batis maritima L. | 51 images |
| Bauhinia lunarioides A.Gray ex S.Watson | 32 images |
| Bauhinia variegata L. | 2853 images |
| Bebbia juncea (Benth.) Greene | 65 images |
| Beckmannia syzigachne (Steud.) Fernald | 16 images |
| Bellardia trixago (L.) All. | 2891 images |
| Berberis fremontii Torr. | 13 images |
| Berberis haematocarpa Wooton | 8 images |
| Berberis repens Lindl. | 1730 images |
| Berberis trifoliolata Moric. | 164 images |
| Berberis vulgaris L. | 5257 images |
| Berberis wilcoxii Kearney | 1 images |
| Berchemia scandens (Hill) K.Koch | 5 images |
| Berlandiera betonicifolia (Hook.) Small | 4 images |
| Berlandiera lyrata Benth. | 69 images |
| Berlandiera pumila Nutt. | 6 images |
| Berteroa incana (L.) DC. | 4731 images |
| Berula erecta (Huds.) Coville | 788 images |
| Betula glandulosa Michx. | 10 images |
| Betula nigra L. | 769 images |
| Betula occidentalis Hook. | 40 images |
| Bidens alba (L.) DC. | 267 images |
| Bidens aristosa (Michx.) Britton | 134 images |
| Bidens bipinnata L. | 1257 images |
| Bidens cernua L. | 471 images |
| Bidens frondosa L. | 2771 images |
| Bidens pilosa L. | 2870 images |
| Bidens tripartita L. | 1102 images |
| Bigelowia nuttallii L.C.Anderson | 2 images |
| Bignonia capreolata L. | 543 images |
| Bistorta bistortoides (Pursh) Small | 1 images |
| Bistorta vivipara (L.) Delarbre | 1171 images |
| Blechnum appendiculatum Willd. | 6 images |
| Blephilia hirsuta (Pursh) Benth. | 81 images |
| Bletia mexicana (Greenm.) Sosa & M.W.Chase | 5 images |
| Bletia spicata (Walter) Sosa & M.W.Chase | 18 images |
| Bletia warnockii (Ames & Correll) Sosa & M.W.Chase | 13 images |
| Blitum capitatum L. | 205 images |
| Blitum virgatum L. | 120 images |
| Boechera drummondii (A.Gray) Á.Löve & D.Löve | 3 images |
| Boehmeria cylindrica (L.) Sw. | 579 images |
| Boehmeria nivea (L.) Gaudich. | 201 images |
| Boerhavia anisophylla Torr. | 4 images |
| Boerhavia coccinea Mill. | 170 images |
| Boerhavia coulteri (Hook.f.) S.Watson | 6 images |
| Boerhavia erecta L. | 181 images |
| Boerhavia spicata Choisy | 3 images |
| Bolboschoenus fluviatilis (Torr.) Soják | 3 images |
| Bolboschoenus maritimus (L.) Palla | 726 images |
| Boltonia asteroides L'Hér. | 3 images |
| Bonamia ovalifolia (Torr.) Hallier f. | 1 images |
| Borrichia frutescens (L.) DC. | 138 images |
| Bothriochloa barbinodis (Lag.) Herter | 442 images |
| Bothriochloa bladhii (Retz.) S.T.Blake | 5 images |
| Bothriochloa ischaemum (L.) Keng | 534 images |
| Bothriochloa pertusa (L.) A.Camus | 3 images |
| Bothriochloa saccharoides (Sw.) Rydb. | 3 images |
| Botrychium dissectum Spreng. | 152 images |
| Botrychium lanceolatum (S.G.Gmel.) Ångstr. | 5 images |
| Botrychium lunaria (L.) Sw. | 491 images |
| Botrychium virginianum (L.) Sw. | 220 images |
| Bouchea spathulata Torr. | 2 images |
| Bouteloua aristidoides (Kunth) Griseb. | 3 images |
| Bouteloua barbata Lag. | 1 images |
| Bouteloua curtipendula (Michx.) Torr. | 114 images |
| Bouteloua dactyloides (Nutt.) Columbus | 2 images |
| Bouteloua gracilis (Kunth) Lag. ex Griffiths | 53 images |
| Bouteloua rigidiseta (Steud.) Hitchc. | 21 images |
| Bouteloua simplex Lag. | 10 images |
| Bouvardia ternifolia (Cav.) Schltdl. | 182 images |
| Bowlesia incana Ruiz & Pav. | 318 images |
| Bradburia pilosa (Nutt.) Semple | 9 images |
| Brasenia schreberi J.F.Gmel. | 4 images |
| Brassica juncea (L.) Czern. | 1373 images |
| Brassica napus L. | 9556 images |
| Brassica oleracea L. | 8350 images |
| Brassica rapa L. | 3810 images |
| Brickellia californica (Torr. & A.Gray) A.Gray | 42 images |
| Brickellia coulteri A.Gray | 4 images |
| Brickellia eupatorioides (L.) Shinners | 77 images |
| Brickellia grandiflora (Hook.) Nutt. | 8 images |
| Brickellia laciniata A.Gray | 3 images |
| Brickellia oblongifolia Nutt. | 3 images |
| Brickellia rusbyi A.Gray | 1 images |
| Brickellia venosa B.L.Rob. | 1 images |
| Briza maxima L. | 1943 images |
| Briza minor L. | 335 images |
| Bromus arizonicus (Shear) Stebbins | 1 images |
| Bromus arvensis L. | 140 images |
| Bromus carinatus Hook. & Arn. | 29 images |
| Bromus catharticus Vahl | 414 images |
| Bromus commutatus Schrad. | 101 images |
| Bromus diandrus Roth | 1338 images |
| Bromus hordeaceus L. | 2893 images |
| Bromus inermis Leyss. | 699 images |
| Bromus lanceolatus Roth | 69 images |
| Bromus marginatus Nees ex Steud. | 1 images |
| Bromus pubescens Muhl. ex Willd. | 5 images |
| Bromus racemosus L. | 191 images |
| Bromus rigidus Roth | 14 images |
| Bromus rubens L. | 378 images |
| Bromus secalinus L. | 232 images |
| Bromus squarrosus L. | 106 images |
| Bromus sterilis L. | 2786 images |
| Bromus tectorum L. | 412 images |
| Broussonetia papyrifera (L.) L'Hér. ex Vent. | 2301 images |
| Brunnichia ovata (Walter) Shinners | 23 images |
| Buddleja lindleyana Fortune | 89 images |
| Buddleja marrubiifolia Benth. | 8 images |
| Buddleja racemosa Torr. | 6 images |
| Buddleja scordioides Kunth | 7 images |
| Buddleja sessiliflora Kunth | 25 images |
| Buglossoides arvensis (L.) I.M.Johnst. | 1150 images |
| Bulbostylis barbata (Rottb.) C.B.Clarke | 13 images |
| Bulbostylis capillaris (L.) Kunth ex C.B.Clarke | 2 images |
| Bupleurum americanum J.M.Coult. & Rose | 1 images |
| Bupleurum lancifolium Hornem. | 31 images |
| Bupleurum rotundifolium L. | 477 images |
| Burmannia capitata (Walter ex J.F.Gmel.) Mart. | 161 images |
| Cabomba caroliniana A.Gray | 61 images |
| Caesalpinia pulcherrima (L.) Sw. | 3132 images |
| Cakile lanceolata (Willd.) O.E.Schulz | 2 images |
| Calamagrostis canadensis (Michx.) P.Beauv. | 3 images |
| Calandrinia ciliata (Ruiz & Pav.) DC. | 32 images |
| Calibrachoa parviflora (Juss.) D'Arcy | 2443 images |
| Calliandra conferta Benth. | 1 images |
| Calliandra eriophylla Benth. | 216 images |
| Calliandra humilis Benth. | 3 images |
| Callicarpa americana L. | 3328 images |
| Callirhoe involucrata (Torr. & A.Gray) A.Gray | 44 images |
| Callisia repens (Jacq.) L. | 2880 images |
| Callitriche heterophylla Pursh | 3 images |
| Callitriche palustris L. | 382 images |
| Callitriche terrestris Raf. | 5 images |
| Calochortus aureus S.Watson | 31 images |
| Calochortus flexuosus S.Watson | 47 images |
| Calochortus gunnisonii S.Watson | 70 images |
| Calochortus kennedyi Porter | 104 images |
| Calochortus nuttallii Torr. | 51 images |
| Calopogon tuberosus (L.) Britton, Sterns & Poggenb. | 72 images |
| Calycoseris wrightii A.Gray | 20 images |
| Calypso bulbosa (L.) Oakes | 434 images |
| Calyptocarpus vialis Less. | 495 images |
| Calyptridium monandrum Nutt. | 43 images |
| Calystegia sepium (L.) R.Br. | 9448 images |
| Calystegia silvatica (Kit.) Griseb. | 1537 images |
| Camassia angusta (Engelm. & A.Gray) Blank. | 5 images |
| Camassia scilloides (Raf.) Cory | 145 images |
| Camelina microcarpa Andrz. ex DC. | 107 images |
| Camelina rumelica Velen. | 17 images |
| Camelina sativa (L.) Crantz | 218 images |
| Campanula rapunculoides L. | 4896 images |
| Campsis radicans (L.) Bureau | 6786 images |
| Canavalia ensiformis (L.) DC. | 46 images |
| Canavalia gladiata (Jacq.) DC. | 22 images |
| Canavalia rosea (Sw.) DC. | 595 images |
| Canna flaccida Salisb. | 48 images |
| Canna glauca L. | 166 images |
| Canna indica L. | 10862 images |
| Cannabis sativa L. | 5383 images |
| Caperonia palustris (L.) A.St.-Hil. | 63 images |
| Capsella bursa-pastoris (L.) Medik. | 9887 images |
| Caragana arborescens Lam. | 1669 images |
| Cardamine bulbosa (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | 26 images |
| Cardamine concatenata (Michx.) O.Schwarz | 376 images |
| Cardamine flexuosa With. | 5353 images |
| Cardamine hirsuta L. | 4015 images |
| Cardamine parviflora L. | 1903 images |
| Cardamine pensylvanica Muhl. ex Willd. | 4 images |
| Cardiospermum halicacabum L. | 1145 images |
| Carduus nutans L. | 4539 images |
| Carduus pycnocephalus L. | 4496 images |
| Carduus tenuiflorus Curtis | 1354 images |
| Carex albolutescens Schwein. | 5 images |
| Carex amplifolia Boott | 1 images |
| Carex aquatilis Wahlenb. | 19 images |
| Carex atherodes Spreng. | 5 images |
| Carex aurea Nutt. | 15 images |
| Carex blanda Dewey | 33 images |
| Carex bromoides Willd. | 4 images |
| Carex brunnescens (Pers.) Poir. | 41 images |
| Carex bushii Mack. | 4 images |
| Carex buxbaumii Wahlenb. | 71 images |
| Carex canescens L. | 128 images |
| Carex capillaris L. | 51 images |
| Carex capitata Sol. | 1 images |
| Carex caroliniana Schwein. | 1 images |
| Carex cephalophora Muhl. ex Willd. | 18 images |
| Carex cherokeensis Schwein. | 19 images |
| Carex comosa Boott | 41 images |
| Carex crinita Lam. | 60 images |
| Carex crus-corvi Shuttlew. ex Kunze | 1 images |
| Carex decomposita Muhl. | 3 images |
| Carex deweyana Schwein. | 7 images |
| Carex diandra Schrank | 77 images |
| Carex disperma Dewey | 3 images |
| Carex ebenea Rydb. | 1 images |
| Carex eburnea Boott | 26 images |
| Carex echinata Murray | 282 images |
| Carex emoryi Dewey | 8 images |
| Carex festucacea Willd. | 1 images |
| Carex filifolia Nutt. | 8 images |
| Carex flaccosperma Dewey | 20 images |
| Carex frankii Kunth | 18 images |
| Carex garberi Fernald | 1 images |
| Carex granularis Muhl. ex Willd. | 11 images |
| Carex grisea Wahlenb. | 20 images |
| Carex hirsutella Mack. | 14 images |
| Carex hyalinolepis Steud. | 5 images |
| Carex hystericina Muhl. ex Willd. | 31 images |
| Carex inops L.H.Bailey | 1 images |
| Carex intumescens Rudge | 112 images |
| Carex jamesii Schwein. | 8 images |
| Carex lachenalii Schkuhr | 46 images |
| Carex laxiflora Lam. | 7 images |
| Carex limosa L. | 117 images |
| Carex longii Mack. | 13 images |
| Carex lupuliformis Sartwell ex Dewey | 8 images |
| Carex lupulina Muhl. ex Willd. | 84 images |
| Carex lurida Wahlenb. | 103 images |
| Carex luzulina Olney | 8 images |
| Carex magellanica Lam. | 67 images |
| Carex meadii Dewey | 6 images |
| Carex mesochorea Mack. | 2 images |
| Carex microdonta Torr. | 1 images |
| Carex microglochin Wahlenb. | 77 images |
| Carex microptera Mack. | 5 images |
| Carex muehlenbergii Willd. | 3 images |
| Carex myosuroides Vill. | 41 images |
| Carex nigromarginata Schwein. | 3 images |
| Carex obtusata Lilj. | 5 images |
| Carex oederi Retz. | 300 images |
| Carex perdentata S.D.Jones | 2 images |
| Carex phaeocephala Piper | 1 images |
| Carex planostachys Kunze | 5 images |
| Carex polystachya Sw. ex Wahlenb. | 16 images |
| Carex praticola Rydb. | 1 images |
| Carex rosea Willd. | 1 images |
| Carex rupestris All. | 51 images |
| Carex simpliciuscula Wahlenb. | 10 images |
| Carex sprengelii Dewey ex Spreng. | 7 images |
| Carex stipata Muhl. ex Willd. | 57 images |
| Carex stricta Lam. | 50 images |
| Carex tenera Dewey | 8 images |
| Carex tetrastachya Scheele | 3 images |
| Carex tribuloides Wahlenb. | 17 images |
| Carex typhina Michx. | 4 images |
| Carex utriculata Boott | 8 images |
| Carex vallicola Dewey | 2 images |
| Carex vesicaria L. | 295 images |
| Carex vulpinoidea Michx. | 114 images |
| Carissa macrocarpa (Eckl.) A.DC. | 2771 images |
| Carlowrightia arizonica A.Gray | 29 images |
| Carlowrightia parviflora (Buckley) Wassh. | 2 images |
| Carminatia tenuiflora DC. | 5 images |
| Carphochaete bigelovii A.Gray | 6 images |
| Carpinus caroliniana Walter | 404 images |
| Carthamus lanatus L. | 1579 images |
| Carthamus tinctorius L. | 931 images |
| Carum carvi L. | 1309 images |
| Carya aquatica (F.Michx.) Nutt. ex Elliott | 14 images |
| Carya cordiformis (Wangenh.) K.Koch | 87 images |
| Carya glabra (Mill.) Sweet | 2066 images |
| Carya illinoinensis (Wangenh.) K.Koch | 844 images |
| Carya laciniosa (F.Michx.) G.Don | 25 images |
| Carya myristiciformis (F.Michx.) Nutt. ex Elliott | 3 images |
| Carya ovata (Mill.) K.Koch | 355 images |
| Carya tomentosa (Lam.) Nutt. | 104 images |
| Castanea pumila (L.) Mill. | 56 images |
| Castilleja coccinea (L.) Spreng. | 105 images |
| Castilleja exserta (A.Heller) T.I.Chuang & Heckard | 31 images |
| Castilleja indivisa Engelm. | 324 images |
| Castilleja integra A.Gray | 4 images |
| Castilleja linariifolia Benth. | 90 images |
| Castilleja miniata Douglas ex Benth. | 362 images |
| Castilleja minor (A.Gray) A.Gray | 38 images |
| Castilleja occidentalis Torr. | 15 images |
| Castilleja patriotica Fernald | 11 images |
| Castilleja rhexiifolia Rydb. | 11 images |
| Castilleja scabrida Eastw. | 11 images |
| Castilleja septentrionalis Lindl. | 26 images |
| Castilleja sessiliflora Pursh | 14 images |
| Castilleja tenuiflora Benth. | 96 images |
| Catabrosa aquatica (L.) P.Beauv. | 71 images |
| Catalpa bignonioides Walter | 13900 images |
| Catalpa speciosa Teas | 513 images |
| Catapodium rigidum (L.) C.E.Hubb. | 421 images |
| Causonis japonica (Thunb.) Raf. | 28 images |
| Cayaponia quinqueloba (Raf.) Shinners | 4 images |
| Ceanothus americanus L. | 694 images |
| Ceanothus fendleri A.Gray | 3 images |
| Ceanothus herbaceus Raf. | 31 images |
| Ceanothus integerrimus Hook. & Arn. | 13 images |
| Celastrus scandens L. | 931 images |
| Celosia argentea L. | 9737 images |
| Celtis laevigata Willd. | 554 images |
| Celtis occidentalis L. | 3693 images |
| Celtis pallida Torr. | 19 images |
| Celtis tenuifolia Nutt. | 37 images |
| Cenchrus × cupreus (Thorpe) Govaerts | 8 images |
| Cenchrus americanus (L.) Morrone | 116 images |
| Cenchrus caudatus (Schrad.) Kuntze | 47 images |
| Cenchrus ciliaris L. | 487 images |
| Cenchrus echinatus L. | 123 images |
| Cenchrus longisetus M.C.Johnst. | 1001 images |
| Cenchrus longispinus (Hack.) Fernald | 80 images |
| Cenchrus nervosus (Nees) Kuntze | 1 images |
| Cenchrus purpureus (Schumach.) Morrone | 451 images |
| Cenchrus setaceus (Forssk.) Morrone | 2694 images |
| Cenchrus spinifex Cav. | 30 images |
| Centaurea benedicta (L.) L. | 349 images |
| Centaurea calcitrapa L. | 1710 images |
| Centaurea cyanus L. | 16421 images |
| Centaurea diffusa Lam. | 206 images |
| Centaurea melitensis L. | 788 images |
| Centaurea solstitialis L. | 1274 images |
| Centaurea stoebe L. | 775 images |
| Centaurium pulchellum (Sw.) Hayek ex Hand.-Mazz., Stadlm., Janch. & Faltis | 46 images |
| Centaurium tenuiflorum (Hoffmanns. & Link) Fritsch | 200 images |
| Centella erecta (L.f.) Fernald | 19 images |
| Centrosema virginianum (L.) Benth. | 504 images |
| Cephalanthus occidentalis L. | 1245 images |
| Cephalanthus salicifolius Humb. & Bonpl. | 3 images |
| Cerastium beeringianum Cham. & Schltdl. | 1 images |
| Cerastium brachypetalum Desp. ex Pers. | 67 images |
| Cerastium glomeratum Thuill. | 4612 images |
| Cerastium holosteoides Fr. | 10 images |
| Cerastium nutans Raf. | 8 images |
| Cerastium pumilum Curtis | 419 images |
| Ceratophyllum demersum L. | 304 images |
| Ceratopteris thalictroides (L.) Brongn. | 41 images |
| Cercis canadensis L. | 6410 images |
| Cercocarpus montanus Raf. | 186 images |
| Cevallia sinuata Lag. | 8 images |
| Chaenactis carphoclinia A.Gray | 26 images |
| Chaenactis stevioides Hook. & Arn. | 68 images |
| Chaenorhinum minus (L.) Lange | 660 images |
| Chaerophyllum tainturieri Hook. & Arn. | 213 images |
| Chaetopappa effusa (A.Gray) Shinners | 2 images |
| Chamaechaenactis scaposa Rydb. | 4 images |
| Chamaecrista fasciculata (Michx.) Greene | 833 images |
| Chamaecrista flexuosa (L.) Greene | 46 images |
| Chamaecrista nictitans (L.) Moench | 212 images |
| Chamaecrista serpens (L.) Greene | 3 images |
| Chamaesaracha crenata Rydb. | 1 images |
| Chamaesaracha villosa Rydb. | 19 images |
| Chaptalia texana Greene | 28 images |
| Chaptalia tomentosa Vent. | 15 images |
| Chasmanthium latifolium (Michx.) H.O.Yates | 405 images |
| Chenopodiastrum murale (L.) S.Fuentes, Uotila & Borsch | 1405 images |
| Chenopodium album L. | 14678 images |
| Chenopodium berlandieri Moq. | 47 images |
| Chenopodium pratericola Rydb. | 17 images |
| Chenopodium standleyanum Aellen | 3 images |
| Cherleria obtusiloba (Rydb.) A.J.Moore & Dillenb. | 16 images |
| Chilopsis linearis (Cav.) Sweet | 417 images |
| Chimaphila umbellata (L.) W.P.C.Barton | 124 images |
| Chiococca alba (L.) Hitchc. | 168 images |
| Chionanthus virginicus L. | 703 images |
| Chionophila jamesii Benth. | 4 images |
| Chloracantha spinosa (Benth.) G.L.Nesom | 5 images |
| Chloris barbata Sw. | 256 images |
| Chloris cucullata Bisch. | 5 images |
| Chloris gayana Kunth | 121 images |
| Chloris verticillata Nutt. | 31 images |
| Chloris virgata Sw. | 67 images |
| Choisya dumosa (Torr. & A.Gray) A.Gray | 37 images |
| Chorispora tenella (Pall.) DC. | 219 images |
| Chorizanthe brevicornu Torr. | 28 images |
| Chromolaena ivifolia (L.) R.M.King & H.Rob. | 7 images |
| Chromolaena odorata (L.) R.M.King & H.Rob. | 899 images |
| Chrysactinia mexicana A.Gray | 51 images |
| Chrysopsis mariana Elliott | 52 images |
| Cichorium intybus L. | 19367 images |
| Cicuta maculata L. | 324 images |
| Cienfuegosia drummondii (A.Gray) Lewton | 2 images |
| Cinna arundinacea L. | 15 images |
| Cinnamomum camphora (L.) J.Presl | 1523 images |
| Circaea alpina L. | 259 images |
| Cirsium altissimum (L.) Spreng. | 268 images |
| Cirsium arizonicum (A.Gray) Petr. | 10 images |
| Cirsium arvense (L.) Scop. | 15486 images |
| Cirsium eatonii B.L.Rob. | 7 images |
| Cirsium horridulum Michx. | 259 images |
| Cirsium muticum Michx. | 70 images |
| Cirsium nuttallii DC. | 10 images |
| Cirsium ochrocentrum A.Gray | 4 images |
| Cirsium parryi Petr. | 5 images |
| Cirsium scariosum Nutt. | 7 images |
| Cirsium texanum Buckley | 232 images |
| Cirsium undulatum Spreng. | 125 images |
| Cirsium vulgare (Savi) Ten. | 20021 images |
| Cissus trifoliata (L.) L. | 10 images |
| Citrullus colocynthis (L.) Schrad. | 434 images |
| Citrullus lanatus (Thunb.) Matsum. & Nakai | 2261 images |
| Citrus trifoliata L. | 2541 images |
| Cladium mariscoides (Muhl.) Torr. | 3 images |
| Cladium mariscus (L.) Pohl | 295 images |
| Claytonia lanceolata Pursh | 37 images |
| Claytonia megarhiza (A.Gray) Parry ex S.Watson | 4 images |
| Claytonia perfoliata Donn ex Willd. | 3370 images |
| Claytonia rosea Rydb. | 9 images |
| Claytonia virginica L. | 1217 images |
| Clematis columbiana (Nutt.) Torr. & A.Gray | 4 images |
| Clematis crispa L. | 100 images |
| Clematis hirsutissima Pursh | 33 images |
| Clematis ligusticifolia Nutt. | 89 images |
| Clematis occidentalis (Hornem.) DC. | 55 images |
| Clematis orientalis L. | 79 images |
| Clematis pitcheri Torr. & A.Gray | 3 images |
| Clematis terniflora DC. | 914 images |
| Clematis texensis Buckley | 78 images |
| Clematis versicolor Small | 4 images |
| Clematis virginiana L. | 833 images |
| Cleome aculeata L. | 47 images |
| Cleome dodecandra L. | 139 images |
| Cleome erosa (Nutt.) Eaton | 3 images |
| Cleome gynandra L. | 439 images |
| Cleome houtteana Schltdl. | 2441 images |
| Cleome uniglandulosa Cav. | 18 images |
| Cleomella lutea (Hook.) Roalson & J.C.Hall | 18 images |
| Cleomella refracta (Engelm.) J.C.Hall & Roalson | 2 images |
| Cleomella serrulata (Pursh) Roalson & J.C.Hall | 72 images |
| Clerodendrum bungei Steud. | 1155 images |
| Clerodendrum indicum (L.) Kuntze | 211 images |
| Clethra alnifolia L. | 883 images |
| Clinopodium arkansanum (Nutt.) House | 1 images |
| Clinopodium brownei (Sw.) Kuntze | 24 images |
| Clinopodium glabellum (Michx.) Kuntze | 14 images |
| Clinopodium vulgare L. | 7367 images |
| Clitoria mariana L. | 130 images |
| Cnidoscolus texanus (Müll.Arg.) Small | 1 images |
| Coccinia grandis (L.) Voigt | 777 images |
| Cocculus carolinus (L.) DC. | 345 images |
| Cocculus diversifolius DC. | 1 images |
| Cochemiea barbata (Engelm.) Doweld | 74 images |
| Cochemiea conoidea (DC.) P.B.Breslin & Majure | 3 images |
| Cochemiea grahamii (Engelm.) Doweld | 207 images |
| Cochemiea viridiflora (Britton & Rose) P.B.Breslin & Majure | 1 images |
| Cochemiea wrightii (Engelm.) Doweld | 173 images |
| Cochlospermum wrightii (A.Gray) Byng & Christenh. | 2 images |
| Coincya tournefortii (Gouan) Alcaraz, T.E.Díaz, Rivas Mart. & Sánchez-Gómez | 347 images |
| Coleataenia anceps (Michx.) Soreng | 3 images |
| Collinsia parviflora Douglas ex Lindl. | 44 images |
| Collinsia verna Nutt. | 71 images |
| Collinsia violacea Nutt. | 11 images |
| Collomia linearis Nutt. | 35 images |
| Colocasia esculenta (L.) Schott | 5170 images |
| Cologania angustifolia Kunth | 9 images |
| Colutea arborescens L. | 3396 images |
| Comandra umbellata (L.) Nutt. | 90 images |
| Comastoma tenellum (Rottb.) Toyok. | 78 images |
| Commelina caroliniana Walter | 8 images |
| Commelina communis L. | 2044 images |
| Commelina dianthifolia Redouté | 15 images |
| Commelina diffusa Burm.f. | 517 images |
| Commelina erecta L. | 1786 images |
| Commelina virginica L. | 54 images |
| Condalia hookeri M.C.Johnst. | 1 images |
| Condalia warnockii M.C.Johnst. | 3 images |
| Conioselinum scopulorum (A.Gray) J.M.Coult. & Rose | 20 images |
| Conium maculatum L. | 7876 images |
| Conocarpus erectus L. | 759 images |
| Conoclinium coelestinum DC. | 1134 images |
| Conoclinium dissectum A.Gray | 1 images |
| Conopholis alpina Liebm. | 52 images |
| Conringia orientalis (L.) C.Presl | 4 images |
| Convolvulus arvensis L. | 16518 images |
| Convolvulus crenatifolius Ruiz & Pav. | 2 images |
| Convolvulus equitans Benth. | 144 images |
| Corallorhiza maculata Raf. | 315 images |
| Corallorhiza odontorhiza (Willd.) Nutt. | 1 images |
| Corallorhiza striata Lindl. | 134 images |
| Corallorhiza trifida Châtel. | 161 images |
| Corallorhiza wisteriana Conrad | 33 images |
| Corchorus hirtus L. | 21 images |
| Cordia boissieri A.DC. | 42 images |
| Coreopsis gladiata Walter | 15 images |
| Coreopsis grandiflora Hogg ex Sweet | 2580 images |
| Coreopsis lanceolata L. | 2803 images |
| Coreopsis nuecensis A.Heller | 15 images |
| Coreopsis pubescens Elliott | 22 images |
| Coreopsis tinctoria Nutt. | 3094 images |
| Coreopsis tripteris L. | 162 images |
| Coriandrum sativum L. | 3217 images |
| Corispermum americanum (Nutt.) Nutt. | 2 images |
| Cornus canadensis L. | 1372 images |
| Cornus drummondii C.A.Mey. | 36 images |
| Cornus florida L. | 5814 images |
| Cornus foemina Mill. | 43 images |
| Cornus racemosa Lam. | 472 images |
| Cornus sericea L. | 7163 images |
| Coronilla varia L. | 9019 images |
| Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. | 4052 images |
| Corydalis aurea Willd. | 98 images |
| Corydalis caseana A.Gray | 20 images |
| Coryphantha echinus (Engelm.) Orcutt | 2 images |
| Coryphantha macromeris (Engelm.) Britton & Rose | 17 images |
| Coryphantha nickelsiae (K.Brandegee) Britton & Rose | 3 images |
| Coryphantha ramillosa Cutak | 8 images |
| Coryphantha sulcata (Engelm.) Britton & Rose | 7 images |
| Cosmos bipinnatus Cav. | 12994 images |
| Cosmos parviflorus (Jacq.) Pers. | 30 images |
| Cosmos sulphureus Cav. | 3967 images |
| Cotinus obovatus Raf. | 370 images |
| Cotula australis Hook.f. | 225 images |
| Crassula connata (Ruiz & Pav.) A.Berger | 4 images |
| Crataegus chrysocarpa Ashe | 8 images |
| Crataegus crus-galli L. | 686 images |
| Crataegus macracantha Lodd. ex Loudon | 7 images |
| Crataegus marshallii Eggl. | 85 images |
| Crataegus mollis (Torr. & A.Gray) Scheele | 30 images |
| Crataegus tracyi Ashe ex Eggl. | 7 images |
| Crataegus uniflora Münchh. | 16 images |
| Crataegus viridis L. | 32 images |
| Crepis acuminata Nutt. | 42 images |
| Crepis capillaris (L.) Wallr. | 9173 images |
| Crepis intermedia A.Gray | 3 images |
| Crepis occidentalis Nutt. | 45 images |
| Crepis pulchra L. | 919 images |
| Crepis setosa Haller f. | 2433 images |
| Crepis zacintha (L.) Loisel. | 7 images |
| Cressa nudicaulis Griseb. | 2 images |
| Cressa truxillensis Kunth | 21 images |
| Crinum americanum L. | 344 images |
| Crinum bulbispermum (Burm.f.) Milne-Redh. & Schweick. | 380 images |
| Crocanthemum carolinianum (Walter) Spach | 5 images |
| Crocanthemum georgianum (Chapm.) Barnhart | 6 images |
| Crocanthemum rosmarinifolium (Pursh) Janch. | 2 images |
| Croptilon divaricatum (Nutt.) Raf. | 9 images |
| Crotalaria incana L. | 215 images |
| Crotalaria pumila Ortega | 65 images |
| Crotalaria sagittalis L. | 57 images |
| Crotalaria spectabilis Roth | 161 images |
| Croton argenteus L. | 29 images |
| Croton argyranthemus Michx. | 3 images |
| Croton capitatus Michx. | 208 images |
| Croton ciliatoglandulifer Ortega | 28 images |
| Croton cortesianus Kunth | 5 images |
| Croton dioicus Cav. | 7 images |
| Croton glandulosus L. | 73 images |
| Croton humilis L. | 3 images |
| Croton incanus Kunth | 9 images |
| Croton monanthogynus Michx. | 107 images |
| Croton punctatus Jacq. | 22 images |
| Cruciata pedemontana (Bellardi) Ehrend. | 125 images |
| Cryptantha minima Rydb. | 9 images |
| Cryptantha pterocarya (Torr.) Greene | 39 images |
| Cryptotaenia canadensis (L.) DC. | 247 images |
| Cucumis anguria L. | 184 images |
| Cucumis dipsaceus Ehrenb. ex Spach | 69 images |
| Cucumis melo L. | 4791 images |
| Cucurbita foetidissima Kunth | 263 images |
| Cucurbita moschata Duchesne | 2661 images |
| Cucurbita pepo L. | 5182 images |
| Cuminum cyminum L. | 59 images |
| Cunila origanoides (L.) Britton | 49 images |
| Cuphea carthagenensis (Jacq.) J.F.Macbr. | 99 images |
| Cuphea glutinosa Cham. & Schltdl. | 37 images |
| Cuphea viscosissima Jacq. | 47 images |
| Cuscuta approximata Bab. | 35 images |
| Cuscuta campestris Yunck. | 584 images |
| Cuscuta cephalanthi Engelm. | 3 images |
| Cuscuta compacta Juss. ex Choisy | 1 images |
| Cuscuta epithymum (L.) L. | 1119 images |
| Cuscuta exaltata Engelm. | 4 images |
| Cuscuta glomerata Choisy | 2 images |
| Cuscuta gronovii Willd. ex Schult. | 4 images |
| Cuscuta indecora Choisy | 15 images |
| Cuscuta pentagona Engelm. | 12 images |
| Cuscuta polygonorum Engelm. | 2 images |
| Cuscuta salina Engelm. | 74 images |
| Cuscuta suaveolens Ser. | 1 images |
| Cuscuta umbellata Kunth | 4 images |
| Cyclachaena xanthiifolia (Nutt.) Fresen. | 98 images |
| Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P.Wilson | 382 images |
| Cylindropuntia × viridiflora (Britton & Rose) F.M.Knuth | 1 images |
| Cylindropuntia bigelovii (Engelm.) F.M.Knuth | 73 images |
| Cylindropuntia davisii (Engelm. & J.M.Bigelow) F.M.Knuth | 4 images |
| Cylindropuntia imbricata (Haw.) F.M.Knuth | 429 images |
| Cylindropuntia kleiniae (DC.) F.M.Knuth | 8 images |
| Cylindropuntia leptocaulis (DC.) F.M.Knuth | 38 images |
| Cylindropuntia tunicata (Lehm.) F.M.Knuth | 172 images |
| Cylindropuntia whipplei (Engelm. & J.M.Bigelow) F.M.Knuth | 25 images |
| Cymopterus alpinus A.Gray | 35 images |
| Cymopterus glomeratus (Nutt.) DC. | 2 images |
| Cymopterus hallii (A.Gray) B.L.Turner | 15 images |
| Cymopterus lemmonii (J.M.Coult. & Rose) Dorn | 70 images |
| Cymopterus petraeus M.E.Jones | 15 images |
| Cymopterus purpureus S.Watson | 3 images |
| Cynanchum laeve (Michx.) Pers. | 180 images |
| Cynanchum racemosum (Jacq.) Jacq. | 16 images |
| Cynodon aethiopicus Clayton & J.R.Harlan | 1 images |
| Cynodon dactylon (L.) Pers. | 2465 images |
| Cynodon nlemfuensis Vanderyst | 31 images |
| Cynoglossum creticum Mill. | 3689 images |
| Cynoglossum officinale L. | 3169 images |
| Cynosurus echinatus L. | 582 images |
| Cyperus aggregatus (Willd.) Endl. | 48 images |
| Cyperus albostriatus Schrad. | 9 images |
| Cyperus alternifolius L. | 2040 images |
| Cyperus articulatus L. | 31 images |
| Cyperus bipartitus Torr. | 6 images |
| Cyperus blepharoleptos Steud. | 3 images |
| Cyperus brevifolius (Rottb.) Hassk. | 145 images |
| Cyperus compressus L. | 43 images |
| Cyperus difformis L. | 107 images |
| Cyperus digitatus Roxb. | 3 images |
| Cyperus entrerianus Boeckeler | 12 images |
| Cyperus eragrostis Lam. | 2339 images |
| Cyperus esculentus L. | 810 images |
| Cyperus flavescens L. | 58 images |
| Cyperus giganteus Vahl | 35 images |
| Cyperus glomeratus L. | 52 images |
| Cyperus granitophilus McVaugh | 1 images |
| Cyperus haspan L. | 129 images |
| Cyperus hermaphroditus (Jacq.) Standl. | 13 images |
| Cyperus hortensis (Salzm. ex Steud.) Dorr | 137 images |
| Cyperus iria L. | 43 images |
| Cyperus laevigatus L. | 48 images |
| Cyperus lanceolatus Poir. | 6 images |
| Cyperus lupulinus (Biehler) Marcks | 2 images |
| Cyperus macrostachyos Lam. | 5 images |
| Cyperus ochraceus Vahl | 7 images |
| Cyperus odoratus L. | 112 images |
| Cyperus pallidicolor (Kük.) G.C.Tucker | 4 images |
| Cyperus polystachyos Rottb. | 16 images |
| Cyperus pseudovegetus Steud. | 5 images |
| Cyperus reflexus Vahl | 3 images |
| Cyperus rotundus L. | 950 images |
| Cyperus seslerioides Kunth | 4 images |
| Cyperus sesquiflorus (Torr.) Mattf. & Kük. | 28 images |
| Cyperus squarrosus L. | 25 images |
| Cyperus strigosus L. | 286 images |
| Cyperus subsquarrosus (Muhl.) Bauters | 160 images |
| Cyperus surinamensis Rottb. | 21 images |
| Cyperus virens Michx. | 11 images |
| Cyphomeris crassifolia (Standl.) Standl. | 2 images |
| Cypripedium kentuckiense C.F.Reed | 1 images |
| Cypripedium parviflorum Salisb. | 305 images |
| Cyrilla racemiflora L. | 75 images |
| Cyrtomium falcatum (L.f.) C.Presl | 359 images |
| Cystopteris bulbifera (L.) Bernh. | 93 images |
| Cystopteris fragilis (L.) Bernh. | 1080 images |
| Cystopteris tenuis (Michx.) Desv. | 3 images |
| Dactylis glomerata L. | 10102 images |
| Dactyloctenium aegyptium (L.) Willd. | 390 images |
| Dactylorhiza viridis (L.) R.M.Bateman, Pridgeon & M.W.Chase | 743 images |
| Dalea bicolor Humb. & Bonpl. ex Willd. | 4 images |
| Dalea candida Willd. | 9 images |
| Dalea compacta Spreng. | 16 images |
| Dalea cylindriceps Barneby | 8 images |
| Dalea formosa Torr. | 63 images |
| Dalea jamesii (Torr.) Torr. & A.Gray | 2 images |
| Dalea lanata Spreng. | 4 images |
| Dalea leporina (Aiton) Bullock | 22 images |
| Dalea multiflora (Nutt.) Shinners | 14 images |
| Dalea pulchra Gentry | 7 images |
| Dalea purpurea Vent. | 232 images |
| Dalea versicolor Zucc. | 11 images |
| Dalea villosa (Nutt.) Spreng. | 3 images |
| Danthonia intermedia Vasey | 2 images |
| Dasiphora fruticosa (L.) Rydb. | 6206 images |
| Dasistoma macrophylla (Nutt.) Raf. | 51 images |
| Dasylirion leiophyllum Engelm. ex Trel. | 40 images |
| Dasylirion texanum Scheele | 79 images |
| Dasylirion wheeleri S.Watson ex Rothr. | 146 images |
| Datura ceratocaula Ortega | 10 images |
| Datura ferox L. | 342 images |
| Datura innoxia Mill. | 1501 images |
| Datura metel L. | 554 images |
| Datura stramonium L. | 14136 images |
| Datura wrightii Regel | 1252 images |
| Daucus carota L. | 24488 images |
| Daucus pusillus Michx. | 194 images |
| Dayia havardii (A.Gray) J.M.Porter | 2 images |
| Decodon verticillatus (L.) Elliott | 48 images |
| Delphinium ajacis L. | 5927 images |
| Delphinium barbeyi (Huth) Huth | 10 images |
| Delphinium carolinianum Walter | 154 images |
| Delphinium geraniifolium Rydb. | 5 images |
| Delphinium nuttallianum Pritz. ex Walp. | 170 images |
| Delphinium scaposum Greene | 18 images |
| Delphinium wootonii Rydb. | 4 images |
| Dennstaedtia globulifera Hieron. | 3 images |
| Dermatophyllum gypsophilum (B.L.Turner & A.M.Powell) Vincent | 1 images |
| Dermatophyllum secundiflorum (Ortega) Gandhi & Reveal | 204 images |
| Deschampsia cespitosa (L.) P.Beauv. | 433 images |
| Deschampsia elongata (Hook.) Munro | 3 images |
| Descurainia pinnata (Walter) Britton | 160 images |
| Descurainia sophia (L.) Webb ex Prantl | 770 images |
| Desmanthus illinoensis (Michx.) MacMill. ex B.L.Rob. & Fernald | 87 images |
| Desmanthus velutinus Scheele | 9 images |
| Desmanthus virgatus (L.) Willd. | 216 images |
| Desmodium canadense (L.) DC. | 201 images |
| Desmodium canescens (L.) DC. | 7 images |
| Desmodium glabellum (Michx.) DC. | 7 images |
| Desmodium incanum (Sw.) DC. | 133 images |
| Desmodium lindheimeri Vail | 3 images |
| Desmodium paniculatum (L.) DC. | 485 images |
| Desmodium procumbens (Mill.) C.L.Hitchc. | 25 images |
| Desmodium psilophyllum Schltdl. | 1 images |
| Desmodium tortuosum (Sw.) DC. | 148 images |
| Desmodium tweedyi Britton | 7 images |
| Dianthera americana L. | 180 images |
| Dianthus armeria L. | 2242 images |
| Dianthus barbatus L. | 10726 images |
| Diaperia prolifera (Nutt. ex DC.) Nutt. | 1 images |
| Diaperia verna (Raf.) Morefield | 8 images |
| Dichanthelium acuminatum (Sw.) Gould & C.A.Clark | 45 images |
| Dichanthelium clandestinum (L.) Gould | 172 images |
| Dichanthelium latifolium (L.) Harvill | 2 images |
| Dichanthelium oligosanthes (Schult.) Gould | 29 images |
| Dichanthelium sabulorum (Lam.) Gould & C.A.Clark | 1 images |
| Dichanthelium scribnerianum (Nash) J.R.Thomas | 2 images |
| Dichanthium annulatum (Forssk.) Stapf | 54 images |
| Dichanthium aristatum (Poir.) C.E.Hubb. | 2 images |
| Dichanthium sericeum (R.Br.) A.Camus | 4 images |
| Dichondra argentea Willd. | 513 images |
| Dichondra carolinensis Michx. | 212 images |
| Dichondra micrantha Urb. | 975 images |
| Dichromanthus cinnabarinus (Lex.) Garay | 34 images |
| Dicliptera brachiata Spreng. | 69 images |
| Dicliptera resupinata (Vahl) Juss. | 28 images |
| Dicliptera sexangularis (L.) Juss. | 11 images |
| Dieteria asteroides Torr. | 5 images |
| Dieteria canescens (Pursh) Nutt. | 68 images |
| Digitaria bicornis (Lam.) Roem. & Schult. | 4 images |
| Digitaria californica (Benth.) Henrard | 4 images |
| Digitaria ciliaris (Retz.) Koeler | 202 images |
| Digitaria eriantha Steud. | 24 images |
| Digitaria filiformis (L.) Koeler | 5 images |
| Digitaria insularis (L.) Mez ex Ekman | 29 images |
| Digitaria ischaemum (Schreb.) Muhl. | 52 images |
| Digitaria milanjiana (Rendle) Stapf | 3 images |
| Digitaria sanguinalis (L.) Scop. | 2177 images |
| Digitaria violascens Link | 12 images |
| Dimorphocarpa candicans (Raf.) Rollins | 8 images |
| Dimorphocarpa wislizeni (Engelm.) Rollins | 4 images |
| Diodia virginiana L. | 379 images |
| Dioscorea polystachya Turcz. | 38 images |
| Dioscorea villosa L. | 285 images |
| Diospyros nigra (J.F.Gmel.) Perr. | 172 images |
| Diospyros texana Scheele | 118 images |
| Diospyros virginiana L. | 2252 images |
| Diplachne fusca (L.) P.Beauv. ex Roem. & Schult. | 44 images |
| Diplotaxis muralis (L.) DC. | 835 images |
| Diplotaxis tenuifolia (L.) DC. | 5601 images |
| Dipsacus fullonum L. | 13187 images |
| Dipterostemon capitatus (Benth.) Rydb. | 468 images |
| Distichlis littoralis (Engelm.) H.L.Bell & Columbus | 4 images |
| Distichlis spicata (L.) Greene | 90 images |
| Distimake dissectus (Jacq.) A.R.Simões & Staples | 257 images |
| Distimake tuberosus (L.) A.R.Simões & Staples | 412 images |
| Draba crassifolia Graham | 1 images |
| Draba helleriana Greene | 8 images |
| Draba nemorosa L. | 83 images |
| Draba spectabilis Greene | 1 images |
| Dracocephalum parviflorum Nutt. | 35 images |
| Drosera brevifolia Pursh | 68 images |
| Drosera capillaris Poir. | 139 images |
| Drosera intermedia Hayne | 414 images |
| Drymocallis arguta (Pursh) Rydb. | 7 images |
| Dryopteris filix-mas (L.) Schott | 6298 images |
| Dryopteris ludoviciana (Kunze) Small | 9 images |
| Dulichium arundinaceum (L.) Britton | 35 images |
| Duranta erecta L. | 7732 images |
| Dyschoriste linearis (Torr. & A.Gray) Kuntze | 34 images |
| Dysphania ambrosioides (L.) Mosyakin & Clemants | 1238 images |
| Dysphania anthelmintica (L.) Mosyakin & Clemants | 1 images |
| Dysphania atriplicifolia (Spreng.) G.Kadereit, Sukhor. & Uotila | 59 images |
| Dysphania botrys (L.) Mosyakin & Clemants | 105 images |
| Dysphania pumilio (R.Br.) Mosyakin & Clemants | 242 images |
| Dyssodia papposa (Vent.) Hitchc. | 23 images |
| Ebenopsis ebano (Berland.) Barneby & J.W.Grimes | 11 images |
| Echeandia flavescens (Schult. & Schult.f.) Cruden | 17 images |
| Echeandia texensis Cruden | 2 images |
| Echeveria strictiflora A.Gray | 3 images |
| Echinacea angustifolia DC. | 1388 images |
| Echinacea pallida (Nutt.) Nutt. | 688 images |
| Echinacea paradoxa Britton | 7 images |
| Echinacea purpurea (L.) Moench | 6310 images |
| Echinacea sanguinea Nutt. | 11 images |
| Echinocactus horizonthalonius Lem. | 107 images |
| Echinocactus texensis Hopffer | 218 images |
| Echinocereus × roetteri (Engelm.) Engelm. ex Rümpler | 5 images |
| Echinocereus arizonicus Rose ex Orcutt | 3 images |
| Echinocereus chisoensis W.T.Marshall | 4 images |
| Echinocereus coccineus Engelm. | 1090 images |
| Echinocereus dasyacanthus Engelm. | 98 images |
| Echinocereus enneacanthus Engelm. | 82 images |
| Echinocereus fasciculatus (Engelm. ex B.D.Jacks.) L.D.Benson | 4 images |
| Echinocereus fendleri (Engelm.) Sencke ex Haage | 7 images |
| Echinocereus papillosus Linke ex C.F.Först. & Rümpler | 2 images |
| Echinocereus pectinatus (Scheidw.) Engelm. | 996 images |
| Echinocereus pentalophus (DC.) Engelm. ex Haage | 5 images |
| Echinocereus poselgeri Lem. | 130 images |
| Echinocereus reichenbachii (Terscheck) Haage | 25 images |
| Echinocereus rigidissimus (Engelm.) Hirscht | 4 images |
| Echinocereus russanthus D.Weniger | 3 images |
| Echinocereus stramineus (Engelm.) Haage | 1 images |
| Echinocereus triglochidiatus Engelm. | 346 images |
| Echinocereus viridiflorus Engelm. | 94 images |
| Echinochloa colonum (L.) Link | 201 images |
| Echinochloa crus-galli (L.) P.Beauv. | 2502 images |
| Echinochloa frumentacea Link | 13 images |
| Echinochloa muricata (P.Beauv.) Fernald | 41 images |
| Echinochloa polystachya (Kunth) Hitchc. | 2 images |
| Echinochloa walteri (Pursh) A.Heller | 1 images |
| Echinocystis lobata (Michx.) Torr. & A.Gray | 730 images |
| Echinodorus berteroi (Spreng.) Fassett | 12 images |
| Echinopepon wrightii (A.Gray) S.Watson | 9 images |
| Echium vulgare L. | 32076 images |
| Eclipta prostrata (L.) L. | 1274 images |
| Egletes viscosa (L.) Less. | 26 images |
| Ehretia anacua (Terán & Berland.) I.M.Johnst. | 14 images |
| Ehrharta calycina Sm. | 4 images |
| Elaeagnus angustifolia L. | 4952 images |
| Elaeagnus commutata Bernh. ex Rydb. | 199 images |
| Elaeagnus pungens Thunb. | 4901 images |
| Elatine rubella Rydb. | 6 images |
| Elatine triandra Schkuhr | 42 images |
| Eleocharis acicularis (L.) Roem. & Schult. | 51 images |
| Eleocharis acutangula (Roxb.) Schult. | 10 images |
| Eleocharis albida Torr. | 2 images |
| Eleocharis atropurpurea (Retz.) J.Presl & C.Presl | 4 images |
| Eleocharis baldwinii (Torr.) Chapm. | 3 images |
| Eleocharis cellulosa Torr. | 1 images |
| Eleocharis compressa Sull. | 16 images |
| Eleocharis elongata Chapm. | 1 images |
| Eleocharis erythropoda Steud. | 5 images |
| Eleocharis exigua (Kunth) Roem. & Schult. | 2 images |
| Eleocharis flavescens (Poir.) Urb. | 8 images |
| Eleocharis interstincta (Vahl) Roem. & Schult. | 8 images |
| Eleocharis macrostachya Britton | 10 images |
| Eleocharis montana (Kunth) Roem. & Schult. | 1 images |
| Eleocharis mutata (L.) Roem. & Schult. | 8 images |
| Eleocharis obtusa (Willd.) Schult. | 31 images |
| Eleocharis palustris (L.) Roem. & Schult. | 618 images |
| Eleocharis quinqueflora (Hartmann) O.Schwarz | 51 images |
| Eleocharis tortilis (Link) Schult. | 1 images |
| Eleocharis uniglumis (Link) Schult. | 28 images |
| Elephantopus carolinianus Raeusch. | 43 images |
| Elephantopus tomentosus L. | 25 images |
| Eleusine indica (L.) Gaertn. | 839 images |
| Ellisia nyctelea (L.) L. | 54 images |
| Elodea canadensis Michx. | 219 images |
| Elodea densa (Planch.) Casp. | 113 images |
| Elodea nuttallii (Planch.) H.St.John | 72 images |
| Elymus canadensis L. | 125 images |
| Elymus elymoides (Raf.) Swezey | 21 images |
| Elymus glaucus Buckley | 13 images |
| Elymus hystrix L. | 48 images |
| Elymus repens (L.) Gould | 568 images |
| Elymus villosus Muhl. ex Willd. | 7 images |
| Elymus violaceus (Hornem.) J.Feilberg | 8 images |
| Elymus virginicus L. | 57 images |
| Elytraria imbricata (Vahl) Pers. | 38 images |
| Emilia fosbergii Nicolson | 651 images |
| Encelia virginensis A.Nelson | 29 images |
| Enemion biternatum Raf. | 7 images |
| Engelmannia peristenia (Raf.) Goodman & C.A.Lawson | 17 images |
| Enneapogon desvauxii P.Beauv. | 7 images |
| Ephedra viridis Coville | 117 images |
| Epifagus virginiana (L.) Barton | 102 images |
| Epilobium anagallidifolium Lam. | 183 images |
| Epilobium angustifolium L. | 16447 images |
| Epilobium brachycarpum C.Presl | 251 images |
| Epilobium canum (Greene) P.H.Raven | 275 images |
| Epilobium ciliatum Raf. | 4084 images |
| Epilobium coloratum Biehler | 52 images |
| Epilobium hallianum Hausskn. | 1 images |
| Epilobium hornemannii Rchb. | 23 images |
| Epilobium lactiflorum Hausskn. | 18 images |
| Epilobium leptophyllum Raf. | 8 images |
| Epilobium oregonense Hausskn. | 4 images |
| Epilobium palustre L. | 366 images |
| Epipactis gigantea Douglas | 171 images |
| Epipactis helleborine (L.) Crantz | 5996 images |
| Epithelantha bokei L.D.Benson | 6 images |
| Epithelantha micromeris (Engelm.) F.A.C.Weber ex Britton & Rose | 61 images |
| Equisetum × ferrissii Clute | 1 images |
| Equisetum arvense L. | 6183 images |
| Equisetum laevigatum A.Braun & Engelm. | 70 images |
| Eragrostis airoides Nees | 5 images |
| Eragrostis barrelieri Daveau | 59 images |
| Eragrostis cilianensis (All.) Vignolo ex Janch. | 88 images |
| Eragrostis ciliaris (L.) R.Br. | 5 images |
| Eragrostis curvula (Schrad.) Nees | 60 images |
| Eragrostis hypnoides (Lam.) Britton, Sterns & Poggenb. | 5 images |
| Eragrostis japonica (Thunb.) Trin. | 5 images |
| Eragrostis lehmanniana Nees | 4 images |
| Eragrostis mexicana (Hornem.) Link | 27 images |
| Eragrostis minor Host | 262 images |
| Eragrostis pectinacea (Michx.) Nees | 27 images |
| Eragrostis pilosa (L.) P.Beauv. | 51 images |
| Eragrostis spectabilis (Pursh) Steud. | 164 images |
| Eragrostis superba Peyr. | 257 images |
| Eragrostis tenella (L.) P.Beauv. ex Roem. & Schult. | 20 images |
| Erechtites hieraciifolius (L.) Raf. ex DC. | 1519 images |
| Eremochloa ophiuroides (Munro) Hack. | 2 images |
| Eremopyrum triticeum (Gaertn.) Nevski | 10 images |
| Erianthus alopecuroides (L.) Elliott | 20 images |
| Erianthus giganteus (Walter) P.Beauv. | 3 images |
| Ericameria cuneata McClatchie | 1 images |
| Erigeron annuus (L.) Desf | 261 images |
| Erigeron bonariensis L. | 2274 images |
| Erigeron caespitosus Nutt. | 3 images |
| Erigeron canadensis L. | 13053 images |
| Erigeron coulteri Porter & J.M.Coult. | 67 images |
| Erigeron divaricatus Michx. | 22 images |
| Erigeron divergens Torr. & A.Gray | 8 images |
| Erigeron flagellaris A.Gray | 2 images |
| Erigeron formosissimus Greene | 5 images |
| Erigeron glabellus Nutt. | 110 images |
| Erigeron grandiflorus Hook. | 1 images |
| Erigeron lonchophyllus Hook. | 13 images |
| Erigeron modestus A.Gray | 6 images |
| Erigeron neomexicanus A.Gray | 2 images |
| Erigeron philadelphicus L. | 3076 images |
| Erigeron procumbens (Mill.) G.L.Nesom | 3 images |
| Erigeron pulchellus Michx. | 223 images |
| Erigeron rhizomatus Cronquist | 3 images |
| Erigeron scopulinus G.L.Nesom & V.D.Roth | 7 images |
| Erigeron speciosus (Lindl.) DC. | 904 images |
| Erigeron strigosus Muhl. ex Willd. | 4101 images |
| Erigeron vetensis Rydb. | 4 images |
| Eriocaulon decangulare L. | 5 images |
| Eriocoma nelsonii (Scribn.) Romasch. | 1 images |
| Eriogonum alatum Torr. | 9 images |
| Eriogonum annuum Nutt. | 14 images |
| Eriogonum cernuum Nutt. | 12 images |
| Eriogonum corymbosum Benth. | 4 images |
| Eriogonum deflexum Torr. | 22 images |
| Eriogonum gypsophilum Wooton & Standl. | 2 images |
| Eriogonum havardii S.Watson | 5 images |
| Eriogonum hemipterum (Torr. & A.Gray) S.Stokes | 2 images |
| Eriogonum inflatum Torr. | 32 images |
| Eriogonum jamesii Benth. | 12 images |
| Eriogonum lachnogynum Torr. ex Benth. | 6 images |
| Eriogonum leptophyllum (Torr.) Wooton & Standl. | 1 images |
| Eriogonum longifolium Nutt. | 8 images |
| Eriogonum maculatum A.Heller | 42 images |
| Eriogonum microtheca Nutt. | 24 images |
| Eriogonum multiflorum Benth. | 16 images |
| Eriogonum ovalifolium Nutt. | 150 images |
| Eriogonum racemosum Nutt. | 12 images |
| Eriogonum rotundifolium Benth. | 1 images |
| Eriogonum shockleyi S.Watson | 7 images |
| Eriogonum subreniforme S.Watson | 2 images |
| Eriogonum tenellum Torr. | 4 images |
| Eriogonum thurberi Torr. | 1 images |
| Eriogonum trichopes Torr. | 14 images |
| Eriogonum umbellatum Torr. | 405 images |
| Eriogonum wrightii Torr. ex Benth. | 97 images |
| Erioneuron pilosum (Buckley) Nash | 10 images |
| Eriophorum angustifolium Honck. | 2211 images |
| Eriophorum scheuchzeri Hoppe | 882 images |
| Erodium botrys (Cav.) Bertol. | 548 images |
| Erodium cicutarium (L.) L'Hér. | 12929 images |
| Eruca vesicaria (L.) Cav. | 3987 images |
| Erucastrum gallicum (Willd.) O.E.Schulz | 303 images |
| Eryngium heterophyllum Engelm. | 30 images |
| Eryngium hookeri Walp. | 12 images |
| Eryngium integrifolium Walter | 5 images |
| Eryngium leavenworthii Torr. & A.Gray | 124 images |
| Eryngium lemmonii J.M.Coult. & Rose | 18 images |
| Eryngium prostratum Nutt. ex DC. | 12 images |
| Eryngium yuccifolium Michx. | 432 images |
| Erysimum asperum (Nutt.) DC. | 97 images |
| Erysimum capitatum (Douglas) Greene | 13 images |
| Erysimum cheiranthoides L. | 1042 images |
| Erysimum repandum L. | 54 images |
| Erythranthe floribunda (Lindl.) G.L.Nesom | 9 images |
| Erythranthe guttata (DC.) G.L.Nesom | 839 images |
| Erythranthe tilingii (Regel) G.L.Nesom | 3 images |
| Erythrina flabelliformis Kearney | 89 images |
| Erythrina herbacea L. | 301 images |
| Erythronium albidum Nutt. | 207 images |
| Erythronium grandiflorum Pursh | 153 images |
| Erythronium rostratum W.Wolf | 13 images |
| Erythrostemon gilliesii (Hook.) Klotzsch | 2453 images |
| Erythrostemon mexicanus (Rose) Gagnon & G.P.Lewis | 14 images |
| Eschscholzia californica Cham. | 13915 images |
| Escobaria dasyacantha (Engelm.) Britton & Rose | 1 images |
| Escobaria duncanii (Hester) Buxb. | 1 images |
| Escobaria emskoetteriana (Quehl) Borg | 103 images |
| Escobaria hesteri (Y.Wright) Buxb. | 13 images |
| Escobaria minima (Baird) D.R.Hunt | 10 images |
| Escobaria missouriensis (Sweet) D.R.Hunt | 14 images |
| Escobaria sneedii Britton & Rose | 21 images |
| Escobaria tuberculosa (Engelm.) Britton & Rose | 9 images |
| Escobaria vivipara (Nutt.) Buxb. | 87 images |
| Esenbeckia berlandieri Baill. | 25 images |
| Eucnide bartonioides Zucc. | 6 images |
| Euonymus americanus L. | 420 images |
| Euonymus atropurpureus Jacq. | 114 images |
| Euonymus fortunei (Turcz.) Hand.-Mazz. | 6121 images |
| Eupatorium altissimum L. | 115 images |
| Eupatorium capillifolium (Lam.) Small ex Porter & Britton | 483 images |
| Eupatorium hyssopifolium L. | 43 images |
| Eupatorium mohrii Greene | 4 images |
| Eupatorium perfoliatum L. | 874 images |
| Eupatorium rotundifolium L. | 35 images |
| Eupatorium serotinum Michx. | 919 images |
| Euphorbia albomarginata Torr. & A.Gray | 33 images |
| Euphorbia antisyphilitica Zucc. | 24 images |
| Euphorbia corollata L. | 198 images |
| Euphorbia cyparissias L. | 15777 images |
| Euphorbia davidii Subils | 37 images |
| Euphorbia dentata Michx. | 18 images |
| Euphorbia glyptosperma Engelm. | 36 images |
| Euphorbia graminea Jacq. | 193 images |
| Euphorbia helioscopia L. | 8653 images |
| Euphorbia heterophylla L. | 989 images |
| Euphorbia hirta L. | 1077 images |
| Euphorbia hypericifolia L. | 1729 images |
| Euphorbia hyssopifolia L. | 119 images |
| Euphorbia lathyris L. | 8886 images |
| Euphorbia maculata L. | 732 images |
| Euphorbia marginata Pursh | 1361 images |
| Euphorbia myrsinites L. | 2134 images |
| Euphorbia nutans Lag. | 366 images |
| Euphorbia parryi Engelm. | 2 images |
| Euphorbia peplus L. | 6592 images |
| Euphorbia prostrata Aiton | 1862 images |
| Euphorbia radians Benth. | 1 images |
| Euphorbia serpens Kunth | 496 images |
| Euphorbia serrula Engelm. | 1 images |
| Euphorbia virgata Waldst. & Kit. | 21 images |
| Euphrosyne acerosa (Nutt.) Panero | 3 images |
| Euploca confertifolia (Torr.) Feuillet & Halse | 1 images |
| Euploca convolvulacea Nutt. | 2 images |
| Euploca greggii (Torr.) Halse & Feuillet | 13 images |
| Euploca procumbens (Mill.) Diane & Hilger | 26 images |
| Euploca tenella (Torr.) Feuillet & Halse | 38 images |
| Euploca torreyi (I.M.Johnst.) Halse & Feuillet | 3 images |
| Eurybia glauca (Nutt.) G.L.Nesom | 2 images |
| Eurybia hemispherica (Alexander) G.L.Nesom | 3 images |
| Eustachys petraea (Sw.) Desv. | 2 images |
| Eustachys retusa (Lag.) Kunth | 4 images |
| Eustoma exaltatum (L.) Salisb. ex G.Don | 62 images |
| Eustoma russellianum (Hook.) G.Don | 1579 images |
| Euthamia graminifolia (L.) Nutt. | 677 images |
| Euthamia gymnospermoides Greene | 13 images |
| Euthamia occidentalis Nutt. | 42 images |
| Eutrochium fistulosum (Barratt) E.E.Lamont | 369 images |
| Eutrochium maculatum (L.) E.E.Lamont | 1259 images |
| Evolvulus alsinoides (L.) L. | 684 images |
| Evolvulus arizonicus A.Gray | 30 images |
| Evolvulus sericeus Sw. | 68 images |
| Eysenhardtia texana Scheele | 35 images |
| Facelis retusa (Lam.) Sch.Bip. | 15 images |
| Fagopyrum esculentum Moench | 5709 images |
| Fagus grandifolia Ehrh. | 2353 images |
| Fallopia baldschuanica (Regel) Holub | 1237 images |
| Fallopia convolvulus (L.) Á.Löve | 1374 images |
| Fallopia dumetorum (L.) Holub | 934 images |
| Fallopia scandens (L.) Holub | 27 images |
| Fallugia paradoxa (D.Don ex Tilloch & Taylor) Endl. ex Torr. | 26 images |
| Fatoua villosa (Thunb.) Nakai | 295 images |
| Ferocactus hamatacanthus (Muehlenpf.) Britton & Rose | 158 images |
| Ferocactus uncinatus (Galeotti) Britton & Rose | 5 images |
| Ferocactus wislizeni (Engelm.) Britton & Rose | 50 images |
| Festuca arizonica Vasey | 3 images |
| Festuca bromoides L. | 202 images |
| Festuca idahoensis Elmer | 3 images |
| Festuca microstachys Nutt. | 18 images |
| Festuca myuros L. | 290 images |
| Festuca octoflora Walter | 10 images |
| Festuca rubra L. | 335 images |
| Festuca trachyphylla (Hack.) Hack. | 18 images |
| Ficus carica L. | 14417 images |
| Filago californica Nutt. | 1 images |
| Fimbristylis autumnalis (L.) Roem. & Schult. | 287 images |
| Fimbristylis cymosa R.Br. | 17 images |
| Fimbristylis dichotoma (L.) Vahl | 59 images |
| Fimbristylis littoralis Gaudich. | 40 images |
| Fimbristylis vahlii (Lam.) Link | 20 images |
| Firmiana simplex (L.) W.Wight | 742 images |
| Flaveria chlorifolia A.Gray | 8 images |
| Flaveria trinervia (Spreng.) C.Mohr | 75 images |
| Fleischmannia incarnata (Walter) R.M.King & H.Rob. | 15 images |
| Fleischmannia sonorae (A.Gray) R.M.King & H.Rob. | 1 images |
| Florestina tripteris DC. | 3 images |
| Flourensia cernua DC. | 2 images |
| Flyriella parryi (A.Gray) R.M.King & H.Rob. | 3 images |
| Foeniculum vulgare Mill. | 10936 images |
| Forestiera acuminata (Michx.) Poir. | 17 images |
| Forestiera angustifolia Torr. | 11 images |
| Forestiera ligustrina (Michx.) Poir. | 18 images |
| Forestiera pubescens Nutt. | 99 images |
| Fouquieria splendens Engelm. | 423 images |
| Fragaria vesca L. | 11481 images |
| Fragaria virginiana Mill. | 365 images |
| Frangula californica (Eschsch.) A.Gray | 53 images |
| Frangula caroliniana (Walter) A.Gray | 90 images |
| Frasera speciosa Douglas ex Griseb. | 57 images |
| Fraxinus americana L. | 4823 images |
| Fraxinus anomala Torr. ex S.Watson | 8 images |
| Fraxinus berlandieriana A.DC. | 1 images |
| Fraxinus caroliniana Mill. | 18 images |
| Fraxinus cuspidata Torr. | 12 images |
| Fraxinus greggii A.Gray | 1 images |
| Fraxinus pennsylvanica Marshall | 894 images |
| Fraxinus velutina Torr. | 117 images |
| Fritillaria atropurpurea Nutt. | 78 images |
| Froelichia floridana (Nutt.) Moq. | 53 images |
| Froelichia gracilis (Hook.) Moq. | 33 images |
| Fuirena pumila (Torr.) Spreng. | 1 images |
| Fuirena simplex Vahl | 8 images |
| Fuirena squarrosa Michx. | 1 images |
| Fumaria densiflora DC. | 679 images |
| Fumaria officinalis L. | 7619 images |
| Fumaria parviflora Lam. | 538 images |
| Funastrum clausum (Jacq.) Schltr. | 50 images |
| Funastrum crispum (Benth.) Schltr. | 3 images |
| Funastrum cynanchoides (Decne.) Schltr. | 37 images |
| Gagea serotina (L.) Ker Gawl. | 113 images |
| Gaillardia aestivalis (Walter) H.Rock | 19 images |
| Gaillardia amblyodon J.Gay | 15 images |
| Gaillardia pinnatifida Torr. | 62 images |
| Gaillardia pulchella Foug. | 3241 images |
| Gaillardia suavis (A.Gray & Engelm.) Britton & Rusby | 16 images |
| Galactia erecta (Walter) Vail | 1 images |
| Galactia volubilis (L.) Britton | 4 images |
| Galinsoga parviflora Cav. | 3224 images |
| Galium aparine L. | 13037 images |
| Galium boreale L. | 935 images |
| Galium circaezans Michx. | 80 images |
| Galium mexicanum Kunth | 3 images |
| Galium obtusum Bigelow | 7 images |
| Galium pilosum Aiton | 7 images |
| Galium spurium L. | 31 images |
| Galium tinctorium L. | 1 images |
| Galium trifidum L. | 36 images |
| Galium triflorum Michx. | 205 images |
| Galium uncinulatum DC. | 1 images |
| Galium virgatum Nutt. | 10 images |
| Gamochaeta americana (Mill.) Wedd. | 285 images |
| Gamochaeta antillana (Urb.) Anderb. | 36 images |
| Gamochaeta pensylvanica (Willd.) Cabrera | 66 images |
| Gamochaeta purpurea (L.) Cabrera | 80 images |
| Garrya flavescens S.Watson | 30 images |
| Garrya wrightii Torr. | 3 images |
| Gaultheria humifusa (Graham) Rydb. | 25 images |
| Gazania linearis (Thunb.) Druce | 1701 images |
| Gelsemium sempervirens (L.) J.St.-Hil. | 259 images |
| Gentiana affinis Griseb. | 35 images |
| Gentiana algida Pall. | 21 images |
| Gentiana fremontii Torr. | 5 images |
| Gentiana parryi Engelm. | 22 images |
| Gentiana saponaria L. | 7 images |
| Gentianella amarella (L.) Börner | 143 images |
| Gentianopsis thermalis (Kuntze) Iltis | 10 images |
| Geranium carolinianum L. | 1292 images |
| Geranium dissectum L. | 6049 images |
| Geranium pusillum L. | 8645 images |
| Geranium richardsonii Fisch. & Trautv. | 21 images |
| Geranium viscosissimum Fisch. & C.A.Mey. | 87 images |
| Geum aleppicum Jacq. | 251 images |
| Geum canadense Jacq. | 105 images |
| Geum macrophyllum Willd. | 3394 images |
| Geum rivale L. | 3713 images |
| Geum rossii (R.Br.) Ser. | 26 images |
| Geum triflorum Pursh | 106 images |
| Gibasis pellucida (M.Martens & Galeotti) D.R.Hunt | 21 images |
| Gilia capitata Sims | 502 images |
| Gilia inconspicua (Sm.) Sweet | 2 images |
| Gilia ophthalmoides Brand | 5 images |
| Gilia sinuata Douglas ex Benth. | 23 images |
| Giliastrum rigidulum (Benth.) Rydb. | 7 images |
| Gillenia stipulata (Muhl. ex Willd.) Nutt. | 6 images |
| Gladiolus communis L. | 3473 images |
| Glaucium corniculatum (L.) Curtis | 105 images |
| Gleditsia aquatica Marshall | 44 images |
| Gleditsia triacanthos L. | 10925 images |
| Glinus lotoides L. | 114 images |
| Glinus radiatus (Ruiz & Pav.) Rohrb. | 1 images |
| Glyceria septentrionalis Hitchc. | 2 images |
| Glyceria striata (Lam.) Hitchc. | 37 images |
| Glycyrrhiza lepidota Pursh | 74 images |
| Gnaphalium exilifolium A.Nelson | 7 images |
| Gnaphalium palustre Nutt. | 35 images |
| Gomphrena caespitosa Torr. | 10 images |
| Gomphrena globosa L. | 2758 images |
| Gomphrena haageana Klotzsch | 184 images |
| Gomphrena nealleyi J.M.Coult. & Fisher | 1 images |
| Gomphrena nitida Rothr. | 5 images |
| Gomphrena serrata L. | 349 images |
| Gomphrena sonorae Torr. | 2 images |
| Gomphrena vermicularis L. | 75 images |
| Goodyera oblongifolia Raf. | 196 images |
| Goodyera repens (L.) R.Br. | 322 images |
| Gossypium hirsutum L. | 509 images |
| Graptopetalum rusbyi (Greene) Rose | 46 images |
| Gratiola neglecta Torr. | 18 images |
| Gratiola virginiana L. | 8 images |
| Grayia spinosa (Hook.) Moq. | 58 images |
| Grindelia arizonica A.Gray | 3 images |
| Grindelia ciliata (Nutt.) Spreng. | 9 images |
| Grindelia grandiflora Hook. | 3 images |
| Grindelia hirsutula Hook. & Arn. | 111 images |
| Grindelia lanceolata Nutt. | 41 images |
| Grindelia nuda Alph.Wood | 1 images |
| Grindelia scabra Greene | 3 images |
| Grindelia squarrosa (Pursh) Dunal | 298 images |
| Grusonia clavata (Engelm.) H.Rob. | 4 images |
| Grusonia emoryi (Engelm.) Pinkava | 2 images |
| Grusonia schottii (Engelm.) H.Rob. | 6 images |
| Guilleminea densa (Willd. ex Schult.) Moq. | 38 images |
| Guilleminea lanuginosa (Poir.) Benth. & Hook.f. | 3 images |
| Gutierrezia microcephala (DC.) A.Gray | 20 images |
| Gutierrezia sarothrae (Pursh) Britton & Rusby | 70 images |
| Gutierrezia sphaerocephala A.Gray | 2 images |
| Gutierrezia texana (DC.) Torr. & A.Gray | 2 images |
| Gutierrezia wrightii A.Gray | 2 images |
| Gymnocarpium dryopteris (L.) Newman | 676 images |
| Gymnocladus dioicus (L.) K.Koch | 486 images |
| Gypsophila acutifolia Steven ex Spreng. | 9 images |
| Gypsophila elegans M.Bieb. | 1159 images |
| Gypsophila scorzonerifolia Ser. | 3 images |
| Gypsophila vaccaria (L.) Sm. | 1428 images |
| Habenaria quinqueseta (Michx.) Eaton | 2 images |
| Habenaria repens Nutt. | 10 images |
| Hackelia floribunda (Lehm.) I.M.Johnst. | 19 images |
| Hackelia pinetorum (Greene ex A.Gray) I.M.Johnst. | 3 images |
| Hackelia virginiana (L.) I.M.Johnst. | 141 images |
| Hackelochloa granularis (L.) Kuntze | 9 images |
| Halerpestes cymbalaria (Pursh) Greene | 11 images |
| Halesia diptera L. | 43 images |
| Halogeton glomeratus (M.Bieb.) Ledeb. | 6 images |
| Hamamelis virginiana L. | 2906 images |
| Haploesthes greggii A.Gray | 2 images |
| Haplophyton crooksii (L.D.Benson) L.D.Benson | 9 images |
| Hechtia glomerata Zucc. | 24 images |
| Hechtia texensis S.Watson | 6 images |
| Hedeoma acinoides Scheele | 5 images |
| Hedeoma drummondii Benth. | 6 images |
| Hedeoma hispida Pursh | 3 images |
| Hedeoma nana (Torr.) Briq. | 11 images |
| Hedera helix L. | 23782 images |
| Hedypnois rhagadioloides (L.) F.W.Schmidt | 428 images |
| Hedysarum boreale Nutt. | 10 images |
| Heimia salicifolia Link | 22 images |
| Helanthium tenellum (Mart. ex Schult.f.) J.G.Sm. | 3 images |
| Helenium amarum (Raf.) H.Rock | 389 images |
| Helenium autumnale L. | 1420 images |
| Helenium drummondii H.Rock | 5 images |
| Helenium elegans DC. | 11 images |
| Helenium flexuosum Raf. | 65 images |
| Helenium microcephalum DC. | 18 images |
| Helianthus × laetiflorus Pers. | 1560 images |
| Helianthus angustifolius L. | 120 images |
| Helianthus annuus L. | 15395 images |
| Helianthus ciliaris DC. | 17 images |
| Helianthus debilis Nutt. | 438 images |
| Helianthus grosseserratus M.Martens | 49 images |
| Helianthus heterophyllus Nutt. | 7 images |
| Helianthus hirsutus Raf. | 79 images |
| Helianthus laciniatus A.Gray | 11 images |
| Helianthus maximiliani Schrad. | 484 images |
| Helianthus mollis Buc'hoz | 90 images |
| Helianthus nuttallii Torr. & A.Gray | 12 images |
| Helianthus occidentalis Riddell | 35 images |
| Helianthus paradoxus Heiser | 5 images |
| Helianthus pauciflorus Nutt. | 176 images |
| Helianthus petiolaris Nutt. | 592 images |
| Helianthus salicifolius A.Dietr. | 150 images |
| Helianthus strumosus L. | 74 images |
| Helianthus tuberosus L. | 7693 images |
| Heliomeris longifolia Cockerell | 6 images |
| Heliomeris multiflora Nutt. | 54 images |
| Heliopsis helianthoides (L.) Sweet | 2200 images |
| Heliopsis parvifolia A.Gray | 15 images |
| Heliotropium amplexicaule Vahl | 328 images |
| Heliotropium angiospermum Murray | 171 images |
| Heliotropium curassavicum L. | 660 images |
| Heliotropium europaeum L. | 4919 images |
| Heliotropium indicum L. | 565 images |
| Heliotropium molle (Torr.) I.M.Johnst. | 3 images |
| Heliotropium verdcourtii Craven | 63 images |
| Hemarthria altissima (Poir.) Stapf & C.E.Hubb. | 17 images |
| Hemerocallis fulva (L.) L. | 10039 images |
| Hemerocallis lilioasphodelus L. | 5508 images |
| Hemionitis aemula (Maxon) Christenh. | 1 images |
| Hemionitis artax Christenh. | 1 images |
| Hemionitis aschenborniana (Klotzsch) Christenh. | 6 images |
| Hemionitis atropurpurea (L.) Christenh. | 45 images |
| Hemionitis bonariensis (Willd.) Christenh. | 14 images |
| Hemionitis eatonii (Baker) Christenh. | 2 images |
| Hemionitis feei (T.Moore) Christenh. | 2 images |
| Hemionitis glabella (Mett.) Christenh. | 11 images |
| Hemionitis greggii (Mett.) Christenh. | 1 images |
| Hemionitis incana (C.Presl) Christenh. | 3 images |
| Hemionitis lanosa (Michx.) Christenh. | 16 images |
| Hemionitis lendigera (Cav.) Christenh. | 7 images |
| Hemionitis leucopoda (Link) Christenh. | 5 images |
| Hemionitis limitanea (Maxon) Christenh. | 1 images |
| Hemionitis lindheimeri (Hook.) Christenh. | 3 images |
| Hemionitis neglecta (Maxon) Christenh. | 2 images |
| Hemionitis sinuata (Lag.) Christenh. | 15 images |
| Hemionitis ternifolia (Cav.) Christenh. | 34 images |
| Hemionitis vooshvazool Christenh. | 1 images |
| Hemionitis wrightiana (Hook.) Christenh. | 2 images |
| Heracleum maximum W.Bartram | 699 images |
| Herbertia lahue (Molina) Goldblatt | 141 images |
| Herissantia crispa (L.) Brizicky | 33 images |
| Hermannia texana A.Gray | 2 images |
| Hesperaloe funifera (K.Koch) Trel. | 4 images |
| Hesperaloe parviflora (Torr.) J.M.Coult. | 341 images |
| Hesperis matronalis L. | 8201 images |
| Hesperocyparis arizonica (Greene) Bartel | 5097 images |
| Heteranthera dubia (Jacq.) MacMill. | 24 images |
| Heteranthera limosa (Sw.) Willd. | 45 images |
| Heteranthera reniformis Ruiz & Pav. | 110 images |
| Heteropogon contortus (L.) P.Beauv. ex Roem. & Schult. | 106 images |
| Heterosperma pinnatum Cav. | 7 images |
| Heterotheca canescens (DC.) Shinners | 16 images |
| Heterotheca pumila (Greene) Semple | 8 images |
| Heterotheca subaxillaris (Lam.) Britton & Rusby | 287 images |
| Heterotheca viscida (A.Gray) V.L.Harms | 8 images |
| Heuchera parvifolia Nutt. | 5 images |
| Heuchera pulchella Wooton & Standl. | 2 images |
| Heuchera rubescens Torr. | 84 images |
| Heuchera sanguinea Engelm. | 6959 images |
| Hexasepalum teres (Walter) J.H.Kirkbr. | 108 images |
| Hibiscus aculeatus Walter | 35 images |
| Hibiscus coccineus Walter | 389 images |
| Hibiscus coulteri Harv. ex A.Gray | 6 images |
| Hibiscus denudatus Benth. | 46 images |
| Hibiscus grandiflorus Michx. | 63 images |
| Hibiscus laevis All. | 94 images |
| Hibiscus martianus Zucc. | 43 images |
| Hibiscus moscheutos L. | 4750 images |
| Hibiscus radiatus Cav. | 7 images |
| Hibiscus striatus Cav. | 27 images |
| Hibiscus syriacus L. | 24284 images |
| Hibiscus trionum L. | 1056 images |
| Hieracium fendleri Sch.Bip. | 1 images |
| Hieracium triste Willd. ex Spreng. | 17 images |
| Hilaria rigida (Thurb.) Benth. ex Scribn. | 7 images |
| Hippeastrum puniceum (Lam.) Voss | 674 images |
| Hippuris vulgaris L. | 494 images |
| Hoffmannseggia glauca (Ortega) Eifert | 102 images |
| Holcus lanatus L. | 5748 images |
| Holodiscus discolor (Pursh) Maxim. | 672 images |
| Hopia obtusa (Kunth) Zuloaga & Morrone | 1 images |
| Hordeum brachyantherum Nevski | 20 images |
| Hordeum jubatum L. | 489 images |
| Hordeum murinum L. | 6986 images |
| Hordeum pusillum Nutt. | 55 images |
| Hordeum vulgare L. | 8621 images |
| Hornungia procumbens (L.) Hayek | 98 images |
| Hottonia inflata Elliott | 4 images |
| Houstonia longifolia Gaertn. | 43 images |
| Houstonia micrantha (Shinners) Terrell | 39 images |
| Houstonia purpurea L. | 120 images |
| Houstonia pusilla Schoepf | 253 images |
| Houstonia rosea (Raf.) Terrell | 10 images |
| Houstonia rubra Cav. | 19 images |
| Hovenia dulcis Thunb. | 222 images |
| Hunnemannia fumariifolia Sweet | 63 images |
| Hunzikeria texana (Torr.) D'Arcy | 4 images |
| Hyacinthus orientalis L. | 10227 images |
| Hydrilla verticillata (L.f.) Royle | 6 images |
| Hydrocleys nymphoides (Humb. & Bonpl. ex Willd.) Buchenau | 42 images |
| Hydrocotyle bonariensis Comm. ex Lam. | 169 images |
| Hydrocotyle ranunculoides L.f. | 199 images |
| Hydrocotyle umbellata L. | 58 images |
| Hydrocotyle verticillata Thunb. | 605 images |
| Hydrolea ovata Nutt. | 54 images |
| Hydrolea spinosa L. | 37 images |
| Hydrophyllum fendleri (A.Gray) A.Heller | 18 images |
| Hygrophila costata Nees | 44 images |
| Hygrophila polysperma (Roxb.) T.Anderson | 43 images |
| Hylodesmum glutinosum (Muhl. ex Willd.) H.Ohashi & R.R.Mill | 74 images |
| Hylodesmum nudiflorum (L.) H.Ohashi & R.R.Mill | 5 images |
| Hymenocallis liriosme (Raf.) Shinners | 180 images |
| Hymenocallis occidentalis (Leconte) Kunth | 13 images |
| Hymenopappus artemisiifolius DC. | 67 images |
| Hymenopappus filifolius Hook. | 55 images |
| Hymenopappus scabiosaeus L'Hér. | 9 images |
| Hymenopappus tenuifolius Pursh | 8 images |
| Hymenothrix wislizeni A.Gray | 4 images |
| Hymenothrix wrightii A.Gray | 15 images |
| Hymenoxys hoopesii (A.Gray) Bierner | 44 images |
| Hymenoxys odorata DC. | 14 images |
| Hymenoxys richardsonii (Hook.) Cockerell | 6 images |
| Hyoscyamus niger L. | 1375 images |
| Hypericum cistifolium Lam. | 9 images |
| Hypericum crux-andreae (L.) Crantz | 3 images |
| Hypericum frondosum Michx. | 83 images |
| Hypericum gentianoides (L.) Britton, Sterns & Poggenb. | 19 images |
| Hypericum hypericoides (L.) Crantz | 250 images |
| Hypericum mutilum L. | 112 images |
| Hypericum perforatum L. | 16741 images |
| Hypericum prolificum L. | 192 images |
| Hypericum punctatum Lam. | 211 images |
| Hypericum scouleri Hook. | 43 images |
| Hypericum sphaerocarpum Michx. | 8 images |
| Hypericum virginicum L. | 21 images |
| Hypochaeris albiflora (Kuntze) Azevêdo-Gonç. & Matzenb. | 47 images |
| Hypochaeris chillensis (Kunth) Britton | 11 images |
| Hypochaeris glabra L. | 2561 images |
| Hypoxis hirsuta (L.) Coville | 287 images |
| Hyptis alata (Raf.) Shinners | 17 images |
| Iberis umbellata L. | 1483 images |
| Ibervillea lindheimeri (A.Gray) Greene | 3 images |
| Ibervillea tenuisecta (A.Gray) Small | 7 images |
| Ilex ambigua (Michx.) Torr. | 4 images |
| Ilex cassine L. | 113 images |
| Ilex coriacea (Pursh) Chapm. | 19 images |
| Ilex decidua Walter | 324 images |
| Ilex myrtifolia Walter | 4 images |
| Ilex opaca Aiton | 1361 images |
| Ilex verticillata (L.) A.Gray | 14 images |
| Ilex vomitoria Aiton | 769 images |
| Iliamna rivularis (Douglas) Greene | 24 images |
| Impatiens capensis Meerb. | 2247 images |
| Imperata brevifolia Vasey | 1 images |
| Imperata cylindrica (L.) Raeusch. | 633 images |
| Indigofera miniata Ortega | 78 images |
| Indigofera suffruticosa Mill. | 77 images |
| Iodanthus pinnatifidus (Michx.) Steud. | 54 images |
| Ionactis linariifolia (L.) Greene | 21 images |
| Ipheion uniflorum (Graham) Raf. | 2617 images |
| Ipomoea alba L. | 603 images |
| Ipomoea amnicola Morong | 13 images |
| Ipomoea batatas (L.) Lam. | 3877 images |
| Ipomoea cairica (L.) Sweet | 1487 images |
| Ipomoea capillacea (Kunth) G.Don | 20 images |
| Ipomoea carnea Jacq. | 930 images |
| Ipomoea coccinea L. | 29 images |
| Ipomoea cordatotriloba Dennst. | 416 images |
| Ipomoea corymbosa (L.) Roth | 28 images |
| Ipomoea costellata Torr. | 9 images |
| Ipomoea cristulata Hallier f. | 50 images |
| Ipomoea dumetorum Willd. | 4 images |
| Ipomoea hederacea Jacq. | 507 images |
| Ipomoea hederifolia L. | 710 images |
| Ipomoea heptaphylla Sweet | 40 images |
| Ipomoea imperati (Vahl) Griseb. | 241 images |
| Ipomoea indica (Burm.) Merr. | 4292 images |
| Ipomoea lacunosa L. | 339 images |
| Ipomoea leptophylla Torr. | 33 images |
| Ipomoea lindheimeri A.Gray | 24 images |
| Ipomoea longifolia Benth. | 15 images |
| Ipomoea muricata (L.) Jacq. | 5 images |
| Ipomoea nil (L.) Roth | 501 images |
| Ipomoea pes-caprae (L.) R.Br. | 292 images |
| Ipomoea plummerae A.Gray | 20 images |
| Ipomoea pubescens Lam. | 19 images |
| Ipomoea purpurea (L.) Roth | 7547 images |
| Ipomoea quamoclit L. | 688 images |
| Ipomoea sagittata Poir. | 157 images |
| Ipomoea setosa Ker Gawl. | 4 images |
| Ipomoea shumardiana (Torr.) Shinners | 3 images |
| Ipomoea tenuiloba Torr. | 14 images |
| Ipomoea tricolor Cav. | 563 images |
| Ipomoea triloba L. | 272 images |
| Ipomoea violacea L. | 21 images |
| Ipomopsis aggregata (Pursh) V.E.Grant | 1 images |
| Ipomopsis congesta (Hook.) V.E.Grant | 40 images |
| Ipomopsis longiflora (Torr.) V.E.Grant | 5 images |
| Ipomopsis macombii (Torr. ex A.Gray) V.E.Grant | 12 images |
| Ipomopsis multiflora (Nutt.) V.E.Grant | 2 images |
| Ipomopsis pumila (Nutt.) V.E.Grant | 5 images |
| Ipomopsis rubra (L.) Wherry | 137 images |
| Iresine diffusa Humb. & Bonpl. ex Willd. | 3063 images |
| Iresine rhizomatosa Standl. | 2 images |
| Iris missouriensis Nutt. | 103 images |
| Iris pseudacorus L. | 9978 images |
| Iris virginica L. | 129 images |
| Isatis tinctoria L. | 3836 images |
| Isocarpha oppositifolia (L.) Cass. | 27 images |
| Isolepis cernua (Vahl) Roem. & Schult. | 106 images |
| Isolepis pseudosetacea (Daveau) Gand. | 6 images |
| Itea virginica L. | 95 images |
| Iva annua L. | 118 images |
| Iva asperifolia Less. | 6 images |
| Iva axillaris Pursh | 6 images |
| Iva frutescens L. | 64 images |
| Iva imbricata Walter | 13 images |
| Jacquemontia tamnifolia (L.) Griseb. | 166 images |
| Jamesia americana Torr. & A.Gray | 20 images |
| Janusia gracilis A.Gray | 6 images |
| Jatropha cathartica Terán & Berland. | 2 images |
| Jatropha dioica Sessé | 10 images |
| Jatropha macrorhiza Benth. | 5 images |
| Johnstonella angustifolia (Torr.) Hasenstab & M.G.Simpson | 3 images |
| Juglans major (Torr.) A.Heller | 55 images |
| Juglans microcarpa Berland. | 11 images |
| Juglans nigra L. | 7498 images |
| Juncus alpinoarticulatus Chaix | 134 images |
| Juncus articulatus L. | 695 images |
| Juncus balticus Willd. | 28 images |
| Juncus biglumis L. | 10 images |
| Juncus brachycarpus Engelm. | 1 images |
| Juncus bufonius L. | 437 images |
| Juncus castaneus Sm. | 16 images |
| Juncus dichotomus Elliott | 7 images |
| Juncus diffusissimus Buckley | 2 images |
| Juncus dudleyi Wiegand | 8 images |
| Juncus effusus L. | 3481 images |
| Juncus interior Wiegand | 3 images |
| Juncus marginatus Rostk. | 4 images |
| Juncus mertensianus Bong. | 8 images |
| Juncus nodosus L. | 3 images |
| Juncus parryi Engelm. | 1 images |
| Juncus roemerianus Scheele | 3 images |
| Juncus scirpoides Lam. | 3 images |
| Juncus tenuis Willd. | 557 images |
| Juncus torreyi Coville | 23 images |
| Juncus triglumis L. | 91 images |
| Juncus validus Coville | 1 images |
| Juniperus ashei J.Buchholz | 6 images |
| Juniperus communis L. | 8465 images |
| Juniperus deppeana Steud. | 92 images |
| Juniperus flaccida Schltdl. | 44 images |
| Juniperus monosperma (Engelm.) Sarg. | 53 images |
| Juniperus osteosperma (Torr.) Little | 403 images |
| Juniperus pinchotii Sudw. | 27 images |
| Juniperus scopulorum Sarg. | 521 images |
| Juniperus virginiana L. | 4513 images |
| Justicia brandegeeana Wassh. & L.B.Sm. | 1580 images |
| Justicia lanceolata (Chapm.) Small | 4 images |
| Justicia longii Hilsenb. | 7 images |
| Justicia pilosella (Nees) Hilsenb. | 38 images |
| Kalanchoe daigremontiana Raym.-Hamet & H.Perrier | 2485 images |
| Kalanchoe delagoensis Eckl. & Zeyh. | 1714 images |
| Kalanchoe fedtschenkoi Raym.-Hamet & H.Perrier | 713 images |
| Kallstroemia californica (S.Watson) Vail | 13 images |
| Kallstroemia grandiflora Torr. ex A.Gray | 62 images |
| Kallstroemia maxima (L.) Hook. & Arn. | 52 images |
| Kallstroemia parviflora Norton | 2 images |
| Karwinskia humboldtiana (Willd. ex Schult.) Zucc. | 1 images |
| Kelloggia galioides Torr. | 8 images |
| Kickxia elatine (L.) Dumort. | 309 images |
| Koeberlinia spinosa Zucc. | 59 images |
| Koeleria macrantha (Ledeb.) Schult. | 136 images |
| Koeleria spicata (L.) Barberá, Quintanar, Soreng & P.M.Peterson | 87 images |
| Koelreuteria elegans (Seem.) A.C.Sm. | 33 images |
| Koelreuteria paniculata Laxm. | 8684 images |
| Kosteletzkya depressa (L.) O.J.Blanch., Fryxell & D.M.Bates | 12 images |
| Kosteletzkya pentacarpos (L.) Ledeb. | 43 images |
| Krameria erecta Willd. | 2 images |
| Krameria lanceolata Torr. | 45 images |
| Krameria ramosissima S.Watson | 2 images |
| Krapovickasia physaloides (C.Presl) Fryxell | 1 images |
| Krigia biflora (Walter) S.F.Blake | 57 images |
| Krigia dandelion Nutt. | 59 images |
| Krigia occidentalis Nutt. | 3 images |
| Krigia virginica (L.) Willd. | 73 images |
| Kummerowia stipulacea (Maxim.) Makino | 3 images |
| Kummerowia striata (Thunb.) Schindl. | 156 images |
| Lactuca biennis (Moench) Fernald | 132 images |
| Lactuca canadensis L. | 404 images |
| Lactuca floridana (L.) Gaertn. | 588 images |
| Lactuca graminifolia Michx. | 8 images |
| Lactuca hirsuta Muhl. ex Nutt. | 23 images |
| Lactuca saligna L. | 333 images |
| Lactuca sativa L. | 4821 images |
| Lactuca serriola L. | 12495 images |
| Lagenaria siceraria (Molina) Standl. | 788 images |
| Lagerstroemia indica L. | 15666 images |
| Laguncularia racemosa (L.) C.F.Gaertn. | 245 images |
| Lagurus ovatus L. | 3461 images |
| Lamarckia aurea (L.) Moench | 572 images |
| Lamium amplexicaule L. | 5179 images |
| Lamium purpureum L. | 16224 images |
| Lantana × strigocamara R.W.Sanders | 2 images |
| Lantana achyranthifolia Desf. | 69 images |
| Lantana canescens Kunth | 413 images |
| Lantana montevidensis (Spreng.) Briq. | 1677 images |
| Lantana velutina M.Martens & Galeotti | 19 images |
| Lappula occidentalis (S.Watson) Greene | 4 images |
| Lappula squarrosa (Retz.) Dumort. | 224 images |
| Lapsana communis L. | 13921 images |
| Larrea tridentata (DC.) Coville | 152 images |
| Lathyrus brachycalyx Rydb. | 18 images |
| Lathyrus hirsutus L. | 577 images |
| Lathyrus lanszwertii Kellogg | 15 images |
| Lathyrus latifolius L. | 9777 images |
| Lathyrus venosus Muhl. ex Willd. | 13 images |
| Launaea intybacea (Jacq.) Beauverd | 15 images |
| Layia glandulosa (Hook.) Hook. & Arn. | 45 images |
| Lechea minor L. | 2 images |
| Lechea mucronata Raf. | 8 images |
| Leersia hexandra Sw. | 44 images |
| Leersia lenticularis Michx. | 1 images |
| Leersia oryzoides (L.) Sw. | 253 images |
| Leersia virginica Willd. | 43 images |
| Leitneria floridana Chapm. | 7 images |
| Lemna aequinoctialis Welw. | 59 images |
| Lemna gibba L. | 70 images |
| Lemna minor L. | 919 images |
| Lemna minuta Kunth | 115 images |
| Lemna trisulca L. | 108 images |
| Lemna turionifera Landolt | 20 images |
| Lemna valdiviana Phil. | 7 images |
| Lenophyllum texanum (Donn.Sm.) Rose | 18 images |
| Leontodon saxatilis Lam. | 1175 images |
| Leonurus cardiaca L. | 3410 images |
| Leonurus japonicus Houtt. | 27 images |
| Lepidium alyssoides A.Gray | 6 images |
| Lepidium austrinum Small | 10 images |
| Lepidium campestre (L.) W.T.Aiton | 15 images |
| Lepidium crenatum (Greene) Rydb. | 3 images |
| Lepidium densiflorum Schrad. | 58 images |
| Lepidium didymum L. | 1461 images |
| Lepidium draba L. | 8095 images |
| Lepidium lasiocarpum Nutt. | 30 images |
| Lepidium latifolium L. | 795 images |
| Lepidium montanum Nutt. | 29 images |
| Lepidium oblongum Small | 8 images |
| Lepidium perfoliatum L. | 40 images |
| Lepidium ruderale L. | 239 images |
| Lepidium thurberi Wooton | 2 images |
| Lepidium virginicum L. | 1741 images |
| Leptochloa crinita (Lag.) P.M.Peterson & N.Snow | 6 images |
| Leptochloa panicea (Retz.) Ohwi | 5 images |
| Lespedeza cuneata (Dum.Cours.) G.Don | 96 images |
| Lespedeza hirta (L.) Hornem. | 75 images |
| Lespedeza procumbens Michx. | 11 images |
| Lespedeza stuevei Nutt. | 6 images |
| Lespedeza texana Britton | 4 images |
| Lespedeza virginica (L.) Britton | 95 images |
| Leucaena pulverulenta (Schltdl.) Benth. | 9 images |
| Leucaena retusa Benth. | 18 images |
| Leucanthemum vulgare Lam. | 10683 images |
| Leucocrinum montanum Nutt. ex A.Gray | 76 images |
| Leucojum aestivum L. | 2200 images |
| Leucophyllum candidum I.M.Johnst. | 124 images |
| Leucophyllum frutescens (Berland.) I.M.Johnst. | 537 images |
| Leucospora multifida (Michx.) Nutt. | 31 images |
| Leuzea repens (L.) D.J.N.Hind | 27 images |
| Levisticum officinale W.D.J.Koch | 1599 images |
| Lewisia nevadensis (A.Gray) B.L.Rob. | 36 images |
| Lewisia pygmaea (A.Gray) B.L.Rob. | 25 images |
| Leymus cinereus (Scribn. & Merr.) Á.Löve | 3 images |
| Leymus racemosus (Lam.) Tzvelev | 13 images |
| Leymus triticoides (Buckley) Pilg. | 19 images |
| Liatris acidota Engelm. & Gray | 1 images |
| Liatris aspera Michx. | 214 images |
| Liatris elegans (Walter) Michx. | 21 images |
| Liatris ligulistylis (A.Nelson) K.Schum. | 1 images |
| Liatris punctata Hook. | 181 images |
| Liatris pycnostachya Michx. | 602 images |
| Liatris spicata (L.) Willd. | 2079 images |
| Liatris squarrulosa Michx. | 7 images |
| Ligusticum porteri J.M.Coult. & Rose | 1 images |
| Ligustrum vulgare L. | 18971 images |
| Lilium michauxii Poir. | 24 images |
| Lilium philadelphicum L. | 116 images |
| Limnophila sessiliflora (Vahl) Blume | 23 images |
| Limnosciadium pinnatum (DC.) Mathias & Constance | 14 images |
| Limonium carolinianum (Walter) Britton | 66 images |
| Limosella aquatica L. | 57 images |
| Linaria dalmatica (L.) Mill. | 198 images |
| Linaria vulgaris Mill. | 17003 images |
| Lindera benzoin (L.) Blume | 867 images |
| Lindernia dubia (L.) Pennell | 218 images |
| Lindheimera texana A.Gray & Engelm. | 42 images |
| Linnaea borealis L. | 613 images |
| Linum aristatum Engelm. | 5 images |
| Linum grandiflorum Desf. | 2698 images |
| Linum imbricatum (Raf.) B.D.Jacks. | 1 images |
| Linum lewisii Pursh | 174 images |
| Linum medium (Planch.) Britton | 20 images |
| Linum neomexicanum Greene | 2 images |
| Linum pratense (Norton) Small | 34 images |
| Linum puberulum (Engelm.) A.Heller | 17 images |
| Linum rigidum Pursh | 17 images |
| Linum rupestre Engelm. ex A.Gray | 7 images |
| Linum sulcatum Riddell | 4 images |
| Linum usitatissimum L. | 5377 images |
| Lippia alba (Mill.) N.E.Br. ex Britton & P.Wilson | 1018 images |
| Lippia origanoides Kunth | 86 images |
| Liquidambar styraciflua L. | 11598 images |
| Lithophragma glabrum Nutt. | 51 images |
| Lithophragma tenellum Nutt. | 5 images |
| Lithospermum calycosum (J.F.Macbr.) I.M.Johnst. | 1 images |
| Lithospermum canescens (Michx.) Lehm. | 142 images |
| Lithospermum cobrense Greene | 13 images |
| Lithospermum incisum Lehm. | 135 images |
| Lithospermum molle (Michx.) Muhl. | 9 images |
| Lithospermum multiflorum Torr. ex A.Gray | 10 images |
| Lithospermum viride Greene | 2 images |
| Lobelia cardinalis L. | 1845 images |
| Lobelia fenestralis Cav. | 5 images |
| Lobelia puberula Michx. | 94 images |
| Lobelia siphilitica L. | 1145 images |
| Lobelia spicata Lam. | 124 images |
| Lobularia maritima (L.) Desv. | 12850 images |
| Loeflingia squarrosa Nutt. | 2 images |
| Loeselia greggii S.Watson | 3 images |
| Loeseliastrum schottii (Torr.) Timbrook | 34 images |
| Lolium arundinaceum (Schreb.) Darbysh. | 783 images |
| Lolium multiflorum Lam. | 359 images |
| Lolium perenne L. | 3080 images |
| Lolium pratense (Huds.) Darbysh. | 755 images |
| Lolium rigidum Gaudin | 195 images |
| Lolium temulentum L. | 29 images |
| Lomatium foeniculaceum (Nutt.) J.M.Coult. & Rose | 6 images |
| Lomatium grayi (J.M.Coult. & Rose) J.M.Coult. & Rose | 31 images |
| Lomatium linearifolium (S.Watson) J.F.Sm. & Mansfield | 3 images |
| Lomatium nevadense (S.Watson) J.M.Coult. & Rose | 36 images |
| Lomatium triternatum (Pursh) J.M.Coult. & Rose | 134 images |
| Lomatogonium rotatum (L.) Fr. | 1 images |
| Lonicera fragrantissima Lindl. & Paxton | 1973 images |
| Lonicera involucrata (Richardson) Banks ex Spreng. | 783 images |
| Lonicera japonica Thunb. | 10066 images |
| Lonicera maackii (Rupr.) Maxim. | 2144 images |
| Lonicera sempervirens L. | 1461 images |
| Lonicera tatarica L. | 5164 images |
| Lonicera utahensis S.Watson | 34 images |
| Lophophora williamsii (Lem. ex Salm-Dyck) J.M.Coult. | 362 images |
| Lotus corniculatus L. | 18978 images |
| Ludwigia alternifolia L. | 206 images |
| Ludwigia bonariensis (Micheli) H.Hara | 12 images |
| Ludwigia decurrens Walter | 40 images |
| Ludwigia glandulosa Walter | 4 images |
| Ludwigia grandiflora (Michx.) Greuter & Burdet | 1162 images |
| Ludwigia leptocarpa (Nutt.) H.Hara | 7 images |
| Ludwigia linearis Walter | 9 images |
| Ludwigia octovalvis (Jacq.) P.H.Raven | 656 images |
| Ludwigia palustris (L.) Elliott | 281 images |
| Ludwigia peploides (Kunth) P.H.Raven | 666 images |
| Ludwigia peruviana (L.) H.Hara | 80 images |
| Ludwigia repens J.R.Forst. | 8 images |
| Ludwigia sphaerocarpa Elliott | 1 images |
| Luffa aegyptiaca Mill. | 61 images |
| Lupinus argenteus Pursh | 105 images |
| Lupinus hillii Greene | 8 images |
| Lupinus latifolius Lindl. ex J.Agardh | 2 images |
| Lupinus neomexicanus Greene | 7 images |
| Lupinus prunophilus M.E.Jones | 1 images |
| Lupinus pusillus Pursh | 14 images |
| Lupinus sericeus Pursh | 49 images |
| Lupinus subcarnosus Hook. | 24 images |
| Lupinus texensis Hook. | 384 images |
| Luzula parviflora (Ehrh.) Desv. | 4 images |
| Luzula spicata (L.) DC. | 64 images |
| Lycium barbarum L. | 2792 images |
| Lycium berlandieri Dunal | 14 images |
| Lycium pallidum Miers | 18 images |
| Lycopodiella appressa (Chapm.) Cranfill | 3 images |
| Lycopodiella cernua (L.) Pic.Serm. | 163 images |
| Lycopodium annotinum L. | 932 images |
| Lycopodium clavatum L. | 700 images |
| Lycopus americanus Muhl. ex W.P.C.Barton | 4 images |
| Lycopus asper Greene | 11 images |
| Lycopus rubellus Moench | 8 images |
| Lycopus virginicus L. | 39 images |
| Lygodesmia grandiflora Torr. & A.Gray | 31 images |
| Lygodesmia texana (Torr. & A.Gray) Greene ex Small | 1 images |
| Lygodium japonicum (Thunb.) Sw. | 108 images |
| Lyonia ligustrina (L.) DC. | 11 images |
| Lyonia mariana (L.) D.Don | 7 images |
| Lysimachia arvensis (L.) U.Manns & Anderb. | 10276 images |
| Lysimachia ciliata L. | 789 images |
| Lysimachia hybrida Michx. | 1 images |
| Lysimachia lanceolata Walter | 24 images |
| Lysimachia maritima (L.) Galasso, Banfi & Soldano | 384 images |
| Lysimachia minima (L.) U.Manns & Anderb. | 18 images |
| Lythrum alatum Pursh | 56 images |
| Lythrum lineare L. | 5 images |
| Lythrum salicaria L. | 23587 images |
| Machaeranthera tagetina Greene | 4 images |
| Machaeranthera tanacetifolia (Kunth) Nees | 119 images |
| Maclura pomifera (Raf.) C.K.Schneid. | 3824 images |
| Macroptilium atropurpureum (DC.) Urb. | 279 images |
| Macrothelypteris torresiana (Gaudich.) Ching | 158 images |
| Madia glomerata Hook. | 5 images |
| Magnolia fraseri Walter | 122 images |
| Magnolia grandiflora L. | 10766 images |
| Magnolia virginiana L. | 2697 images |
| Maianthemum racemosum (L.) Link | 1513 images |
| Maianthemum stellatum (L.) Link | 558 images |
| Malachra capitata (L.) L. | 14 images |
| Malacothrix fendleri A.Gray | 6 images |
| Malacothrix glabrata A.Gray | 95 images |
| Malacothrix sonchoides (Nutt.) Torr. & A.Gray | 8 images |
| Malaxis unifolia Michx. | 17 images |
| Malpighia glabra L. | 728 images |
| Malus domestica (Suckow) Borkh. | 7243 images |
| Malus ioensis (Alph.Wood) Britton | 14 images |
| Malva neglecta Wallr. | 5325 images |
| Malva parviflora L. | 2737 images |
| Malva sylvestris L. | 25957 images |
| Malva trimestris (L.) Salisb. | 3024 images |
| Malva verticillata L. | 216 images |
| Malvastrum americanum (L.) Torr. | 23 images |
| Malvastrum aurantiacum (Scheele) Walp. | 8 images |
| Malvastrum coromandelianum (L.) Garcke | 746 images |
| Malvaviscus arboreus Dill. ex Cav. | 50 images |
| Malvaviscus penduliflorus Moc. & Sessé ex DC. | 298 images |
| Malvella lepidota (A.Gray) Fryxell | 1 images |
| Malvella leprosa (Ortega) Krapov. | 119 images |
| Mammillaria heyderi Muehlenpf. | 34 images |
| Mammillaria lasiacantha Engelm. | 244 images |
| Mammillaria pottsii Scheer ex Salm-Dyck | 24 images |
| Mammillaria prolifera (Mill.) Haw. | 1226 images |
| Mammillaria sphaerica A.Dietr. | 102 images |
| Mandevilla brachysiphon (Torr.) Pichon | 2 images |
| Mandevilla macrosiphon (Torr.) Pichon | 8 images |
| Manihot esculenta Crantz | 1120 images |
| Manihot grahamii Hook. | 111 images |
| Manihot walkerae Croizat | 1 images |
| Marrubium vulgare L. | 4343 images |
| Marshallia caespitosa Nutt. ex DC. | 20 images |
| Marshallia graminifolia (Walter) Small | 4 images |
| Marsilea macropoda Engelm. ex A.Braun | 3 images |
| Marsilea mutica Mett. | 2 images |
| Matelea biflora (Raf.) Woodson | 45 images |
| Matelea carolinensis (Jacq.) Woodson | 54 images |
| Matelea decipiens (Alexander) Woodson | 10 images |
| Matelea edwardsensis Correll | 6 images |
| Matelea parvifolia (Torr.) Woodson | 13 images |
| Matelea reticulata (Engelm. ex A.Gray) Woodson | 55 images |
| Matricaria chamomilla L. | 9852 images |
| Matricaria discoidea DC. | 3508 images |
| Matthiola incana (L.) W.T.Aiton | 172 images |
| Matthiola longipetala (Vent.) DC. | 526 images |
| Maurandella antirrhiniflora (Humb. & Bonpl. ex Willd.) Rothm. | 16 images |
| Mayaca fluviatilis Aubl. | 40 images |
| Mazus pumilus (Burm.f.) Steenis | 260 images |
| Mecardonia acuminata (Walter) Small | 6 images |
| Mecardonia procumbens (Mill.) Small | 197 images |
| Medicago arabica (L.) Huds. | 3419 images |
| Medicago lupulina L. | 6894 images |
| Medicago minima (L.) Bartal. | 32 images |
| Medicago orbicularis (L.) Bartal. | 761 images |
| Medicago polymorpha L. | 2734 images |
| Medicago sativa L. | 16098 images |
| Megathyrsus maximus (Jacq.) B.K.Simon & S.W.L.Jacobs | 180 images |
| Melampodium cinereum DC. | 10 images |
| Melampodium leucanthum Torr. & A.Gray | 70 images |
| Melanocalyx uniflora (L.) Morin | 2 images |
| Melanthium virginicum L. | 9 images |
| Melia azedarach L. | 10693 images |
| Melica montezumae Piper | 1 images |
| Melica mutica Walter | 20 images |
| Melica nitens (Scribn.) Nutt. ex Piper | 3 images |
| Melica porteri Scribn. | 1 images |
| Melilotus albus Medik. | 6799 images |
| Melilotus indicus (L.) All. | 2323 images |
| Melilotus officinalis (L.) Lam. | 3957 images |
| Melinis repens (Willd.) Zizka | 515 images |
| Melochia corchorifolia L. | 83 images |
| Melochia pyramidata L. | 143 images |
| Melochia tomentosa L. | 86 images |
| Melothria pendula L. | 493 images |
| Menispermum canadense L. | 249 images |
| Menodora heterophylla Moric. ex DC. | 10 images |
| Mentha × dumetorum Schult. | 1 images |
| Mentha × piperita L. | 3197 images |
| Mentha × rotundifolia (L.) Huds. | 1013 images |
| Mentha arvensis L. | 2996 images |
| Mentha canadensis L. | 13 images |
| Mentha spicata L. | 8638 images |
| Mentha suaveolens Ehrh. | 10807 images |
| Mentzelia decapetala (Sims) Urb. | 10 images |
| Mentzelia montana (Davidson) Davidson | 3 images |
| Mentzelia multiflora (Nutt.) A.Gray | 61 images |
| Mentzelia oligosperma Nutt. ex Sims | 1 images |
| Menyanthes trifoliata L. | 1821 images |
| Mertensia franciscana A.Heller | 11 images |
| Mertensia lanceolata (Pursh) DC. | 18 images |
| Mertensia oblongifolia (Nutt.) G.Don | 26 images |
| Meximalva filipes (A.Gray) Fryxell | 1 images |
| Micranthemum umbrosum (J.F.Gmel.) S.F.Blake | 22 images |
| Micranthes rhomboidea (Greene) Small | 16 images |
| Micranthes texana (Buckley) Small | 10 images |
| Microchloa kunthii Desv. | 80 images |
| Microseris cuspidata (Pursh) Sch.Bip. | 15 images |
| Microstegium vimineum (Trin.) A.Camus | 98 images |
| Microsteris gracilis (Hook.) Greene | 20 images |
| Mikania cordifolia (L.f.) Willd. | 70 images |
| Mikania scandens (L.) Willd. | 280 images |
| Milla biflora Cav. | 37 images |
| Mimosa aculeaticarpa Ortega | 43 images |
| Mimosa pigra L. | 337 images |
| Mimosa quadrivalvis L. | 288 images |
| Mimosa strigillosa Torr. & A.Gray | 3 images |
| Mimulus alatus Aiton | 108 images |
| Mimulus ringens L. | 435 images |
| Mirabilis albida (Walter) Heimerl | 47 images |
| Mirabilis gigantea (Standl.) Shinners | 3 images |
| Mirabilis jalapa L. | 14897 images |
| Mirabilis linearis (Pursh) Heimerl | 13 images |
| Mirabilis longiflora L. | 279 images |
| Mirabilis melanotricha (Standl.) Spellenb. | 15 images |
| Mirabilis multiflora (Torr.) A.Gray | 149 images |
| Mirabilis nyctaginea (Michx.) MacMill. | 217 images |
| Mitchella repens L. | 914 images |
| Mitracarpus hirtus (L.) DC. | 336 images |
| Mitreola petiolata (J.F.Gmel.) Torr. & A.Gray | 2 images |
| Modiola caroliniana (L.) G.Don | 199 images |
| Moehringia lateriflora (L.) Fenzl | 43 images |
| Moehringia macrophylla (Hook.) Fenzl | 25 images |
| Mollugo verticillata L. | 322 images |
| Moluccella laevis L. | 272 images |
| Momordica balsamina L. | 242 images |
| Monarda bradburiana Beck | 15 images |
| Monarda citriodora Cerv. ex Lag. | 374 images |
| Monarda fistulosa L. | 2193 images |
| Monarda pectinata Nutt. | 11 images |
| Monarda punctata L. | 351 images |
| Monarda russeliana Nutt. ex Sims | 17 images |
| Monardella odoratissima Benth. | 218 images |
| Moneses uniflora (L.) A.Gray | 312 images |
| Monnina wrightii A.Gray | 4 images |
| Mononeuria nuttallii (Torr. & A.Gray) Dillenb. & Kadereit | 3 images |
| Mononeuria patula (Michx.) Dillenb. & Kadereit | 27 images |
| Monotropa hypopitys L. | 1076 images |
| Monotropa uniflora L. | 1092 images |
| Montia chamissoi (Ledeb. ex Spreng.) Greene | 5 images |
| Moorochloa eruciformis (Sm.) Veldkamp | 9 images |
| Mortonia scabrella A.Gray | 1 images |
| Morus alba L. | 11541 images |
| Morus rubra L. | 2753 images |
| Muhlenbergia capillaris (Lam.) Trin. | 219 images |
| Muhlenbergia emersleyi Vasey | 1 images |
| Muhlenbergia fragilis Swallen | 1 images |
| Muhlenbergia frondosa (Poir.) Fernald | 8 images |
| Muhlenbergia glabrifloris Scribn. | 1 images |
| Muhlenbergia lindheimeri Hitchc. | 27 images |
| Muhlenbergia longiligula Hitchc. | 1 images |
| Muhlenbergia mexicana (L.) Trin. | 5 images |
| Muhlenbergia pauciflora Buckley | 7 images |
| Muhlenbergia peruviana (P.Beauv.) Steud. | 5 images |
| Muhlenbergia porteri Scribn. | 10 images |
| Muhlenbergia pungens Thurb. | 1 images |
| Muhlenbergia reverchonii Vasey & Scribn. | 2 images |
| Muhlenbergia rigens (Benth.) Hitchc. | 24 images |
| Muhlenbergia schreberi J.F.Gmel. | 6 images |
| Muhlenbergia torreyi (Kunth) Hitchc. ex Bush | 1 images |
| Muhlenbergia tricholepis (Torr.) P.M.Peterson | 3 images |
| Murdannia nudiflora (L.) Brenan | 134 images |
| Muscari botryoides (L.) Mill. | 5470 images |
| Muscari neglectum Guss. ex Ten. | 10700 images |
| Myagrum perfoliatum L. | 158 images |
| Myosotis macrosperma Engelm. | 88 images |
| Myosotis scorpioides L. | 5795 images |
| Myosotis verna Nutt. | 12 images |
| Myrica caroliniensis Mill. | 9 images |
| Myrica cerifera L. | 593 images |
| Myriophyllum aquaticum (Vell.) Verdc. | 573 images |
| Myriophyllum heterophyllum Michx. | 9 images |
| Myriophyllum sibiricum Kom. | 7 images |
| Myriophyllum spicatum L. | 297 images |
| Myriophyllum verticillatum L. | 69 images |
| Myriopus volubilis (L.) Small | 5 images |
| Myrtus communis L. | 9200 images |
| Nabalus altissimus (L.) Hook. | 3 images |
| Nahuatlea hypoleuca (DC.) V.A.Funk | 4 images |
| Najas guadalupensis (Spreng.) Magnus | 14 images |
| Najas marina L. | 116 images |
| Nama havardii A.Gray | 14 images |
| Nama jamaicensis L. | 2 images |
| Nandina domestica Thunb. | 7218 images |
| Nanogalactia heterophylla (Gillies ex Hook.) L.P.Queiroz | 6 images |
| Narcissus × compressus Haw. | 6 images |
| Narcissus × incomparabilis Mill. | 82 images |
| Narcissus × odorus L. | 15 images |
| Narcissus jonquilla L. | 2031 images |
| Narcissus papyraceus Ker Gawl. | 1255 images |
| Narcissus pseudonarcissus L. | 9444 images |
| Narcissus tazetta L. | 3117 images |
| Nassella tenuissima (Trin.) Barkworth | 1209 images |
| Nasturtium microphyllum (Boenn.) Rchb. | 72 images |
| Nasturtium officinale W.T.Aiton | 718 images |
| Nectouxia formosa Kunth | 2 images |
| Nelumbo lutea (Willd.) Pers. | 5 images |
| Nelumbo nucifera Gaertn. | 1931 images |
| Nemastylis geminiflora Nutt. | 41 images |
| Nemophila aphylla (L.) Brummitt | 29 images |
| Nemophila phacelioides W.P.C.Barton | 102 images |
| Neottia bifolia (Raf.) Baumbach | 1 images |
| Neottia cordata (L.) Rich. | 212 images |
| Nepeta cataria L. | 3746 images |
| Nephrolepis exaltata (L.) Schott | 2952 images |
| Neptunia lutea (Leavenw.) Benth. | 13 images |
| Neptunia plena (L.) Benth. | 116 images |
| Neptunia pubescens Benth. | 23 images |
| Nerisyrenia camporum (A.Gray) Greene | 8 images |
| Nicotiana glauca Graham | 3606 images |
| Nicotiana obtusifolia M.Martens & Galeotti | 1 images |
| Nicotiana repanda Willd. ex Lehm. | 1 images |
| Nicotiana rustica L. | 354 images |
| Nissolia platycalyx S.Watson | 1 images |
| Noccaea fendleri (A.Gray) Holub | 36 images |
| Noccaea perfoliata (L.) Al-Shehbaz | 1223 images |
| Nolina arenicola Correll | 2 images |
| Nolina erumpens (Torr.) S.Watson | 1 images |
| Nolina lindheimeriana (Scheele) S.Watson | 4 images |
| Nolina microcarpa S.Watson | 12 images |
| Nolina texana S.Watson | 25 images |
| Nothoscordum bivalve (L.) Britton | 621 images |
| Nuphar polysepala Engelm. | 4 images |
| Nuttallanthus canadensis (L.) D.A.Sutton | 22 images |
| Nyctaginia capitata Choisy | 45 images |
| Nymphaea ampla (Salisb.) DC. | 154 images |
| Nymphaea elegans Hook. | 28 images |
| Nymphaea mexicana Zucc. | 177 images |
| Nymphaea odorata Aiton | 414 images |
| Nymphoides humboldtiana (Kunth) Kuntze | 3 images |
| Nymphoides peltata (S.G.Gmel.) Kuntze | 444 images |
| Nyssa aquatica L. | 51 images |
| Nyssa biflora Walter | 5 images |
| Nyssa sylvatica Marshall | 1020 images |
| Obolaria virginica L. | 66 images |
| Oenothera albicaulis Pursh | 60 images |
| Oenothera biennis L. | 14435 images |
| Oenothera brachycarpa A.Gray | 4 images |
| Oenothera cespitosa Nutt. | 50 images |
| Oenothera drummondii Hook. | 205 images |
| Oenothera elata Kunth | 185 images |
| Oenothera filiformis (Small) W.L.Wagner & Hoch | 4 images |
| Oenothera flava (A.Nelson) Garrett | 39 images |
| Oenothera grandis Smyth | 2 images |
| Oenothera hartwegii Benth. | 67 images |
| Oenothera havardii S.Watson | 2 images |
| Oenothera kunthiana (Spach) Munz | 1 images |
| Oenothera laciniata Hill | 562 images |
| Oenothera lavandulifolia Torr. & A.Gray | 3 images |
| Oenothera lindheimeri (Engelm. & A.Gray) W.L.Wagner & Hoch | 7562 images |
| Oenothera linifolia Nutt. | 14 images |
| Oenothera macrocarpa Nutt. | 638 images |
| Oenothera neomexicana (Small) Munz | 20 images |
| Oenothera pallida Lindl. | 40 images |
| Oenothera primiveris A.Gray | 32 images |
| Oenothera rhombipetala Nutt. | 7 images |
| Oenothera rosea L'Hér. ex Aiton | 1378 images |
| Oenothera speciosa Nutt. | 3117 images |
| Oenothera suffrutescens (Moc. & Sessé ex Ser.) W.L.Wagner & Hoch | 90 images |
| Oenothera suffulta (Engelm.) W.L.Wagner & Hoch | 10 images |
| Oenothera tetraptera Cav. | 15 images |
| Oenothera toumeyi (Small) Tidestr. | 2 images |
| Oenothera triloba Nutt. | 83 images |
| Oenothera villosa Thunb. | 75 images |
| Oldenlandia corymbosa L. | 451 images |
| Oligomeris linifolia (Vahl ex Hornem.) J.F.Macbr. | 10 images |
| Onobrychis viciifolia Scop. | 7501 images |
| Onoclea sensibilis L. | 1614 images |
| Onopordum acanthium L. | 5046 images |
| Operculina pinnatifida (Kunth) O'Donell | 8 images |
| Ophioglossum crotalophoroides Walter | 4 images |
| Ophioglossum engelmannii Prantl | 12 images |
| Ophioglossum petiolatum Hook. | 10 images |
| Ophioglossum polyphyllum A.Braun ex Seub. | 1 images |
| Ophioglossum vulgatum L. | 358 images |
| Oplismenus compositus (L.) P.Beauv. | 35 images |
| Opuntia aciculata Griffiths | 118 images |
| Opuntia atrispina Griffiths | 6 images |
| Opuntia camanchica Engelm. & J.M.Bigelow | 2 images |
| Opuntia cespitosa Raf. | 1 images |
| Opuntia chlorotica Engelm. & J.M.Bigelow | 3 images |
| Opuntia engelmannii Salm-Dyck ex Engelm. | 661 images |
| Opuntia ficus-indica (L.) Mill. | 6598 images |
| Opuntia fragilis (Nutt.) Haw. | 165 images |
| Opuntia macrocentra Engelm. | 224 images |
| Opuntia macrorhiza Engelm. | 72 images |
| Opuntia orbiculata Salm-Dyck ex Pfeiff. | 78 images |
| Opuntia phaeacantha Engelm. | 526 images |
| Opuntia polyacantha Haw. | 493 images |
| Opuntia rufida Engelm. | 50 images |
| Opuntia stricta (Haw.) Haw. | 1435 images |
| Opuntia strigil Engelm. | 4 images |
| Oreocarya thyrsiflora Greene | 3 images |
| Oreochrysum parryi Rydb. | 8 images |
| Ornithogalum umbellatum L. | 8531 images |
| Orobanche cooperi (A.Gray) A.Heller | 35 images |
| Orobanche fasciculata Nutt. | 138 images |
| Orobanche ludoviciana Nutt. | 11 images |
| Orobanche minor Sm. | 2274 images |
| Orobanche pinorum Geyer ex Hook. | 3 images |
| Orobanche ramosa L. | 465 images |
| Orobanche uniflora L. | 115 images |
| Orontium aquaticum L. | 135 images |
| Orthilia secunda (L.) House | 475 images |
| Orthocarpus luteus Nutt. | 5 images |
| Oryza sativa L. | 459 images |
| Osmorhiza berteroi DC. | 8 images |
| Osmorhiza depauperata Phil. | 7 images |
| Osmorhiza longistylis (Torr.) DC. | 372 images |
| Osmunda spectabilis Willd. | 4 images |
| Osmundastrum cinnamomeum (L.) C.Presl | 170 images |
| Ostrya knowltonii Coville | 2 images |
| Ostrya virginiana (Mill.) K.Koch | 346 images |
| Oxalis articulata Savigny | 5356 images |
| Oxalis corniculata L. | 9170 images |
| Oxalis debilis Kunth | 2959 images |
| Oxalis decaphylla Kunth | 8 images |
| Oxalis dichondrifolia A.Gray | 4 images |
| Oxalis dillenii Jacq. | 2514 images |
| Oxalis drummondii A.Gray | 57 images |
| Oxalis frutescens L. | 87 images |
| Oxalis latifolia Kunth | 2566 images |
| Oxalis stricta L. | 2400 images |
| Oxalis violacea L. | 581 images |
| Oxybasis glauca (L.) S.Fuentes, Uotila & Borsch | 253 images |
| Oxybasis rubra (L.) S.Fuentes, Uotila & Borsch | 644 images |
| Oxypolis fendleri (A.Gray) A.Heller | 7 images |
| Oxypolis rigidior (L.) Raf. | 22 images |
| Oxyria digyna (L.) Hill | 399 images |
| Oxytropis deflexa (Pall.) DC. | 14 images |
| Oxytropis lambertii Pursh | 50 images |
| Oxytropis splendens Douglas | 16 images |
| Packera cana (Hook.) W.A.Weber & Á.Löve | 1 images |
| Packera dubia (Spreng.) Trock & Mabb. | 8 images |
| Packera glabella (Poir.) C.Jeffrey | 248 images |
| Paepalanthus anceps (Walter) Christenh. & Byng | 1 images |
| Palafoxia hookeriana Torr. & A.Gray | 17 images |
| Palafoxia reverchonii (Bush) Cory | 2 images |
| Palafoxia rosea (Bush) Cory | 13 images |
| Palafoxia sphacelata (Nutt. ex Torr.) Cory | 8 images |
| Palafoxia texana DC. | 13 images |
| Paliurus spina-christi Mill. | 2501 images |
| Panicum amarum Elliott | 10 images |
| Panicum capillare L. | 670 images |
| Panicum coloratum L. | 58 images |
| Panicum dichotomiflorum Michx. | 81 images |
| Panicum hirsutum Sw. | 5 images |
| Panicum miliaceum L. | 1217 images |
| Panicum repens L. | 82 images |
| Panicum trichoides Sw. | 29 images |
| Panicum virgatum L. | 943 images |
| Papaver rhoeas L. | 12229 images |
| Papaver somniferum L. | 10515 images |
| Pappophorum mucronulatum Nees | 3 images |
| Pappostipa speciosa (Trin. & Rupr.) Romasch. | 9 images |
| Parapholis cylindrica (Willd.) Romero Zarco | 20 images |
| Parapholis incurva (L.) C.E.Hubb. | 86 images |
| Parentucellia viscosa (L.) Caruel | 1012 images |
| Parietaria floridana Nutt. | 63 images |
| Parietaria judaica L. | 5302 images |
| Parietaria pensylvanica Muhl. ex Willd. | 203 images |
| Parkinsonia aculeata L. | 2082 images |
| Parnassia asarifolia Vent. | 8 images |
| Parnassia fimbriata K.D.Koenig | 42 images |
| Parnassia grandifolia DC. | 8 images |
| Parnassia palustris L. | 4245 images |
| Paronychia fastigiata (Raf.) Fernald | 7 images |
| Paronychia pulvinata A.Gray | 1 images |
| Paronychia sessiliflora Nutt. | 3 images |
| Paronychia virginica Spreng. | 12 images |
| Parthenium argentatum A.Gray | 7 images |
| Parthenium confertum A.Gray | 4 images |
| Parthenium hysterophorus L. | 1102 images |
| Parthenium incanum Kunth | 31 images |
| Parthenium integrifolium L. | 197 images |
| Parthenocissus heptaphylla (Planch.) Britton | 5 images |
| Parthenocissus quinquefolia (L.) Planch. | 16000 images |
| Parthenocissus vitacea (Knerr) Hitchc. | 3 images |
| Paspalum bifidum (Bertol.) Nash | 7 images |
| Paspalum conjugatum P.J.Bergius | 31 images |
| Paspalum dilatatum Poir. | 1182 images |
| Paspalum distichum L. | 259 images |
| Paspalum floridanum Michx. | 5 images |
| Paspalum malacophyllum Trin. | 4 images |
| Paspalum notatum Flüggé | 46 images |
| Paspalum plicatulum Michx. | 31 images |
| Paspalum repens P.J.Bergius | 167 images |
| Paspalum scrobiculatum L. | 21 images |
| Paspalum setaceum Michx. | 13 images |
| Paspalum urvillei Steud. | 90 images |
| Paspalum vaginatum Sw. | 41 images |
| Paspalum virgatum L. | 39 images |
| Passiflora affinis Engelm. | 5 images |
| Passiflora ciliata Aiton | 21 images |
| Passiflora filipes Benth. | 5 images |
| Passiflora foetida L. | 1377 images |
| Passiflora incarnata L. | 522 images |
| Passiflora lutea L. | 301 images |
| Passiflora pallida L. | 14 images |
| Passiflora tenuiloba Engelm. | 7 images |
| Pastinaca sativa L. | 6395 images |
| Paulownia tomentosa (Thunb.) Steud. | 9103 images |
| Pavonia hastata Cav. | 159 images |
| Pavonia lasiopetala Scheele | 40 images |
| Paxistima myrsinites (Pursh) Raf. | 86 images |
| Pectiantia pentandra (Hook.) Rydb. | 22 images |
| Pectis angustifolia Torr. | 9 images |
| Pectis papposa Harv. & A.Gray | 10 images |
| Pectis prostrata Cav. | 32 images |
| Pectocarya setosa A.Gray | 21 images |
| Pedicularis angustifolia Benth. | 5 images |
| Pedicularis bracteosa Benth. | 47 images |
| Pedicularis canadensis L. | 204 images |
| Pedicularis centranthera A.Gray | 10 images |
| Pedicularis crenulata Benth. | 6 images |
| Pedicularis groenlandica Retz. | 127 images |
| Pedicularis parryi A.Gray | 10 images |
| Pedicularis procera A.Gray | 4 images |
| Pedicularis racemosa Douglas ex Benth. | 43 images |
| Pediocactus knowltonii L.D.Benson | 7 images |
| Pediocactus simpsonii (Engelm.) Britton & Rose | 23 images |
| Pediomelum rhombifolium (Torr. & A.Gray) Rydb. | 1 images |
| Peganum harmala L. | 401 images |
| Peltandra virginica (L.) Schott | 147 images |
| Peniocereus greggii (Engelm.) Britton & Rose | 33 images |
| Penstemon albidus Nutt. | 10 images |
| Penstemon ambiguus Torr. | 23 images |
| Penstemon angustifolius Nutt. ex Pursh | 7 images |
| Penstemon baccharifolius Hook. | 26 images |
| Penstemon barbatus (Cav.) Roth | 946 images |
| Penstemon buckleyi Pennell | 6 images |
| Penstemon campanulatus (Cav.) Willd. | 2 images |
| Penstemon cardinalis Wooton & Standl. | 2 images |
| Penstemon cobaea Nutt. | 167 images |
| Penstemon dasyphyllus A.Gray | 4 images |
| Penstemon digitalis Nutt. ex Sims | 1220 images |
| Penstemon eatonii A.Gray | 84 images |
| Penstemon glaber Pursh | 20 images |
| Penstemon gracilis Nutt. | 21 images |
| Penstemon havardii A.Gray | 4 images |
| Penstemon jamesii Benth. | 14 images |
| Penstemon laxiflorus Pennell | 15 images |
| Penstemon lentus Pennell | 8 images |
| Penstemon linarioides A.Gray | 20 images |
| Penstemon murrayanus Hook. | 8 images |
| Penstemon palmeri A.Gray | 103 images |
| Penstemon pinifolius Greene | 21 images |
| Penstemon pseudospectabilis M.E.Jones | 1 images |
| Penstemon rostriflorus Kellogg | 89 images |
| Penstemon rydbergii A.Nelson | 78 images |
| Penstemon secundiflorus Benth. | 62 images |
| Penstemon strictus Benth. | 138 images |
| Penstemon tenuis Small | 49 images |
| Penstemon thurberi Torr. | 8 images |
| Penstemon triflorus A.Heller | 5 images |
| Penstemon virgatus A.Gray | 9 images |
| Penstemon whippleanus A.Gray | 45 images |
| Penthorum sedoides L. | 44 images |
| Pentodon pentandrus (Schumach. & Thonn.) Vatke | 4 images |
| Pentzia incana (Thunb.) Kuntze | 16 images |
| Pereskia aculeata Mill. | 1141 images |
| Pericome caudata A.Gray | 16 images |
| Perideridia parishii (J.M.Coult. & Rose) A.Nelson & J.F.Macbr. | 18 images |
| Perilla frutescens (L.) Britton | 2482 images |
| Periploca graeca L. | 334 images |
| Perityle microglossa Benth. | 8 images |
| Persea borbonia (L.) Spreng. | 64 images |
| Persea palustris (Raf.) Sarg. | 3 images |
| Persicaria amphibia (L.) Delarbre | 398 images |
| Persicaria capitata (Buch.-Ham. ex D.Don) H.Gross | 2125 images |
| Persicaria glabra (Willd.) M.Gómez | 18 images |
| Persicaria hispida (Kunth) M.Gómez | 5 images |
| Persicaria hydropiper (L.) Delarbre | 663 images |
| Persicaria hydropiperoides (Michx.) Small | 18 images |
| Persicaria lapathifolia (L.) Delarbre | 3231 images |
| Persicaria longiseta (Bruijn) Kitag. | 7 images |
| Persicaria maculosa Gray | 9396 images |
| Persicaria meisneriana (Cham. & Schltdl.) M.Gómez | 2 images |
| Persicaria orientalis (L.) Spach | 2745 images |
| Persicaria pensylvanica (L.) M.Gómez | 64 images |
| Persicaria punctata (Elliott) Small | 77 images |
| Persicaria sagittata (L.) H.Gross | 19 images |
| Persicaria virginiana (L.) Gaertn. | 1045 images |
| Petiveria alliacea L. | 583 images |
| Petradoria pumila (Nutt.) Greene | 10 images |
| Petrophytum caespitosum (Nutt.) Rydb. | 22 images |
| Petrorhagia dubia (Raf.) G.López & Romo | 63 images |
| Petroselinum crispum (Mill.) Fuss | 2585 images |
| Phacelia affinis A.Gray | 11 images |
| Phacelia alba Rydb. | 1 images |
| Phacelia cephalotes A.Gray | 31 images |
| Phacelia coerulea Greene | 12 images |
| Phacelia congesta Hook. | 66 images |
| Phacelia crenulata Torr. ex S.Watson | 147 images |
| Phacelia cryptantha Greene | 32 images |
| Phacelia heterophylla Pursh | 58 images |
| Phacelia hirsuta Nutt. | 13 images |
| Phacelia integrifolia Torr. | 20 images |
| Phacelia ivesiana Torr. | 4 images |
| Phacelia neomexicana Thurb. ex Torr. | 5 images |
| Phacelia rupestris Greene | 3 images |
| Phacelia sericea (Graham) A.Gray | 44 images |
| Phalaris angusta Nees ex Trin. | 6 images |
| Phalaris aquatica L. | 237 images |
| Phalaris arundinacea L. | 2889 images |
| Phalaris brachystachys Link | 9 images |
| Phalaris canariensis L. | 477 images |
| Phalaris minor Retz. | 176 images |
| Phanerophlebia umbonata Underw. | 26 images |
| Phaseolus pedicellatus Benth. | 5 images |
| Phaseolus polystachios (L.) Britton, Sterns & Poggenb. | 3 images |
| Phaulothamnus spinescens A.Gray | 3 images |
| Phemeranthus brevicaulis (S.Watson) Kiger | 3 images |
| Phemeranthus brevifolius (Torr.) Hershk. | 2 images |
| Phemeranthus calycinus (Engelm.) Kiger | 14 images |
| Phemeranthus parviflorus (Nutt.) Kiger | 7 images |
| Philadelphus microphyllus A.Gray | 16 images |
| Philadelphus pubescens Loisel. | 1183 images |
| Philadelphus serpyllifolius A.Gray | 1 images |
| Philadelphus texensis S.Y.Hu | 3 images |
| Phleum alpinum L. | 318 images |
| Phleum pratense L. | 2599 images |
| Phlox austromontana Coville | 59 images |
| Phlox caespitosa Nutt. | 24 images |
| Phlox carolina L. | 42 images |
| Phlox condensata (A.Gray) E.E.Nelson | 7 images |
| Phlox cuspidata Scheele | 9 images |
| Phlox divaricata L. | 1049 images |
| Phlox drummondii Hook. | 1429 images |
| Phlox hoodii Richardson | 80 images |
| Phlox longifolia Nutt. | 111 images |
| Phlox mesoleuca Greene | 23 images |
| Phlox nana Nutt. | 9 images |
| Phlox pilosa L. | 187 images |
| Phlox pulvinata (Wherry) Cronquist | 13 images |
| Phlox roemeriana Scheele | 17 images |
| Phoradendron bolleanum (Seem.) Eichler | 2 images |
| Phoradendron californicum Nutt. | 131 images |
| Phoradendron leucarpum (Raf.) Reveal & M.C.Johnst. | 3 images |
| Phoradendron macrophyllum (Engelm.) Cockerell | 4 images |
| Photinia serratifolia (Desf.) Kalkman | 2820 images |
| Phragmites australis (Cav.) Trin. ex Steud. | 6518 images |
| Phryma leptostachya L. | 158 images |
| Phyla cuneifolia (Torr.) Greene | 1 images |
| Phyla lanceolata (Michx.) Greene | 124 images |
| Phyla nodiflora (L.) Greene | 1541 images |
| Phyllanthus caroliniensis Walter | 18 images |
| Phyllanthus niruri L. | 208 images |
| Phyllanthus polygonoides Nutt. ex Spreng. | 30 images |
| Phyllanthus tenellus Roxb. | 759 images |
| Phyllanthus urinaria L. | 479 images |
| Phyllostachys aurea (André) Rivière & C.Rivière | 1397 images |
| Physalis acutifolia (Miers) Sandwith | 3 images |
| Physalis angulata L. | 1016 images |
| Physalis crassifolia Benth. | 94 images |
| Physalis heterophylla Nees | 128 images |
| Physalis ixocarpa Brot. ex Hornem. | 25 images |
| Physalis longifolia Nutt. | 221 images |
| Physalis mollis Nutt. | 8 images |
| Physalis pubescens L. | 173 images |
| Physalis pumila Nutt. | 10 images |
| Physalis virginiana Mill. | 2 images |
| Physaria acutifolia Rydb. | 3 images |
| Physaria fendleri (A.Gray) O'Kane & Al-Shehbaz | 1 images |
| Physocarpus monogynus (Torr.) J.M.Coult. | 2 images |
| Physostegia angustifolia Fernald | 9 images |
| Physostegia correllii (Lundell) Shinners | 4 images |
| Physostegia digitalis Small | 4 images |
| Physostegia virginiana (L.) Benth. | 2040 images |
| Phytolacca americana L. | 18665 images |
| Picea engelmannii Parry ex Engelm. | 207 images |
| Picea pungens Engelm. | 5430 images |
| Picradeniopsis absinthifolia (Benth.) B.G.Baldwin | 8 images |
| Picradeniopsis multiflora (Hook. & Arn.) B.G.Baldwin | 23 images |
| Pilea pumila A.Gray | 485 images |
| Pilostyles thurberi A.Gray | 25 images |
| Pilularia americana A.Braun | 1 images |
| Pinaropappus roseus (Less.) Less. | 38 images |
| Pinguicula pumila Michx. | 13 images |
| Pinus aristata Engelm. | 235 images |
| Pinus arizonica Engelm. | 18 images |
| Pinus cembroides Zucc. | 54 images |
| Pinus echinata Mill. | 136 images |
| Pinus edulis Engelm. | 144 images |
| Pinus engelmannii Carrière | 1 images |
| Pinus flexilis E.James | 57 images |
| Pinus leiophylla Schiede ex Schltdl. & Cham. | 7 images |
| Pinus monophylla Torr. & Frém. | 33 images |
| Pinus palustris Mill. | 152 images |
| Pinus ponderosa Douglas ex C.Lawson | 468 images |
| Pinus taeda L. | 392 images |
| Pisonia aculeata L. | 95 images |
| Pistacia chinensis Bunge | 251 images |
| Pistacia mexicana Kunth | 21 images |
| Pistia stratiotes L. | 964 images |
| Pithecellobium dulce (Roxb.) Benth. | 612 images |
| Pityopsis graminifolia (Michx.) Nutt. | 52 images |
| Plagiobothrys arizonicus (A.Gray) Greene ex A.Gray | 10 images |
| Plantago aristata Michx. | 26 images |
| Plantago coronopus L. | 2617 images |
| Plantago elongata Pursh | 17 images |
| Plantago eriopoda Torr. | 12 images |
| Plantago helleri Small | 7 images |
| Plantago heterophylla Nutt. | 1 images |
| Plantago lanceolata L. | 13959 images |
| Plantago major L. | 10148 images |
| Plantago ovata Forssk. | 259 images |
| Plantago patagonica Jacq. | 51 images |
| Plantago pusilla Nutt. | 10 images |
| Plantago rhodosperma Decne. | 34 images |
| Plantago rugelii Decne. | 216 images |
| Plantago virginica L. | 182 images |
| Plantago wrightiana Decne. | 9 images |
| Platanthera aquilonis Sheviak | 21 images |
| Platanthera blephariglottis (Willd.) Lindl. | 36 images |
| Platanthera chapmanii (Small) Luer | 3 images |
| Platanthera ciliaris (L.) Lindl. | 79 images |
| Platanthera clavellata (Michx.) Luer | 43 images |
| Platanthera cristata (Michx.) Lindl. | 5 images |
| Platanthera dilatata (Pursh) Lindl. ex L.C.Beck | 4 images |
| Platanthera flava (L.) Lindl. | 17 images |
| Platanthera lacera (Michx.) G.Don | 39 images |
| Platanthera nivea (Nutt.) Luer | 6 images |
| Platanthera obtusata (Banks ex Pursh) Lindl. | 12 images |
| Platanthera sparsiflora (S.Watson) Schltr. | 46 images |
| Platanus occidentalis L. | 8127 images |
| Platanus wrightii S.Watson | 2 images |
| Plectocephalus americanus (Nutt.) D.Don | 6 images |
| Pleopeltis polylepis T.Moore | 3 images |
| Pluchea baccharis (Mill.) Pruski | 5 images |
| Pluchea camphorata (L.) DC. | 49 images |
| Pluchea foetida (L.) DC. | 15 images |
| Pluchea odorata (L.) Cass. | 268 images |
| Pluchea sericea Coville | 56 images |
| Plumbago zeylanica L. | 350 images |
| Poa alpina L. | 319 images |
| Poa angustifolia L. | 4 images |
| Poa annua L. | 3033 images |
| Poa arachnifera Torr. | 19 images |
| Poa arida Vasey | 2 images |
| Poa autumnalis Muhl. ex Elliott | 2 images |
| Poa bulbosa L. | 1224 images |
| Poa compressa L. | 123 images |
| Poa fendleriana (Steud.) Vasey | 12 images |
| Poa glauca Vahl | 40 images |
| Poa leptocoma Trin. | 9 images |
| Poa nemoralis L. | 427 images |
| Poa occidentalis (Vasey) Vasey | 6 images |
| Poa palustris L. | 128 images |
| Poa pratensis L. | 3032 images |
| Poa secunda J.Presl | 9 images |
| Poa tracyi Vasey | 7 images |
| Poa trivialis L. | 1926 images |
| Podagrostis humilis (Vasey) Björkman | 1 images |
| Podophyllum peltatum L. | 1974 images |
| Pogonia ophioglossoides (L.) Ker Gawl. | 107 images |
| Polemonium foliosissimum A.Gray | 30 images |
| Polemonium occidentale Greene | 103 images |
| Polemonium pauciflorum S.Watson | 12 images |
| Polemonium pulcherrimum Hook. | 89 images |
| Polemonium viscosum Nutt. | 25 images |
| Poliomintha incana (Torr.) A.Gray | 2 images |
| Polycarpon tetraphyllum (L.) L. | 1233 images |
| Polygala alba Nutt. | 26 images |
| Polygala cruciata L. | 9 images |
| Polygala cymosa Walter | 2 images |
| Polygala mariana Mill. | 3 images |
| Polygala polygama Walter | 28 images |
| Polygala sanguinea L. | 60 images |
| Polygala verticillata L. | 5 images |
| Polygonatum biflorum (Walter) Elliott | 735 images |
| Polygonum arenastrum Boreau | 175 images |
| Polygonum aviculare L. | 5082 images |
| Polygonum douglasii Greene | 5 images |
| Polygonum polygaloides Meisn. | 1 images |
| Polygonum tenue Michx. | 3 images |
| Polypodium hesperium Maxon | 10 images |
| Polypogon maritimus Willd. | 35 images |
| Polypogon monspeliensis (L.) Desf. | 822 images |
| Polypogon viridis (Gouan) Breistr. | 216 images |
| Polypremum procumbens L. | 84 images |
| Polystichum acrostichoides (Michx.) Schott | 622 images |
| Polytaenia nuttallii DC. | 16 images |
| Polytaenia texana (J.M.Coult. & Rose) Mathias & Constance | 88 images |
| Pombalia verticillata (Ortega) Paula-Souza | 9 images |
| Pontederia cordata L. | 1483 images |
| Pontederia crassipes Mart. | 1623 images |
| Ponthieva racemosa (Walter) C.Mohr | 13 images |
| Populus alba L. | 11916 images |
| Populus angustifolia E.James | 5 images |
| Populus deltoides W.Bartram ex Marshall | 597 images |
| Populus fremontii S.Watson | 13 images |
| Populus nigra L. | 13979 images |
| Populus tremuloides Michx. | 1382 images |
| Porlieria angustifolia (Engelm.) A.Gray | 8 images |
| Porophyllum gracile Benth. | 24 images |
| Porophyllum ruderale (Jacq.) Cass. | 302 images |
| Portulaca grandiflora Hook. | 7816 images |
| Portulaca halimoides L. | 31 images |
| Portulaca oleracea L. | 12405 images |
| Portulaca pilosa L. | 714 images |
| Portulaca suffrutescens Engelm. | 18 images |
| Portulaca umbraticola Kunth | 1519 images |
| Potamogeton alpinus Balb. | 23 images |
| Potamogeton berchtoldii Fieber | 24 images |
| Potamogeton crispus L. | 164 images |
| Potamogeton diversifolius Raf. | 1 images |
| Potamogeton foliosus Raf. | 5 images |
| Potamogeton gramineus L. | 40 images |
| Potamogeton natans L. | 549 images |
| Potamogeton nodosus Poir. | 312 images |
| Potamogeton pusillus L. | 43 images |
| Potentilla concinna Richardson | 8 images |
| Potentilla gracilis Douglas ex Hook. | 187 images |
| Potentilla hippiana Lehm. | 10 images |
| Potentilla indica (Andrews) Th.Wolf | 5334 images |
| Potentilla nivea L. | 26 images |
| Potentilla norvegica L. | 721 images |
| Potentilla pensylvanica L. | 16 images |
| Potentilla plattensis Nutt. | 1 images |
| Potentilla recta L. | 3440 images |
| Potentilla simplex Michx. | 487 images |
| Potentilla supina L. | 188 images |
| Potentilla thurberi A.Gray | 82 images |
| Primula angustifolia Torr. | 12 images |
| Primula meadia (L.) A.R.Mast & Reveal | 267 images |
| Primula parryi A.Gray | 35 images |
| Primula pauciflora (Durand) A.R.Mast & Reveal | 41 images |
| Primula rusbyi Greene | 4 images |
| Priva lappulacea (L.) Pers. | 324 images |
| Proboscidea althaeifolia (Benth.) Decne. | 3 images |
| Proboscidea louisianica (Mill.) Thell. | 219 images |
| Prosartes trachycarpa S.Watson | 38 images |
| Proserpinaca palustris L. | 4 images |
| Proserpinaca pectinata Lam. | 2 images |
| Prosopis glandulosa Torr. | 468 images |
| Prosopis laevigata (Humb. & Bonpl. ex Willd.) M.C.Johnst. | 9 images |
| Prosopis pubescens Benth. | 40 images |
| Prosopis velutina Wooton | 31 images |
| Prunella vulgaris L. | 19023 images |
| Prunus americana Marshall | 66 images |
| Prunus angustifolia Marshall | 3 images |
| Prunus armeniaca L. | 5719 images |
| Prunus avium (L.) L. | 20318 images |
| Prunus caroliniana (Mill.) Aiton | 140 images |
| Prunus cerasus L. | 10596 images |
| Prunus mahaleb L. | 6800 images |
| Prunus mexicana S.Watson | 9 images |
| Prunus persica (L.) Batsch | 10419 images |
| Prunus rivularis Scheele | 27 images |
| Prunus serotina Ehrh. | 8526 images |
| Prunus umbellata Elliott | 42 images |
| Prunus virginiana L. | 2913 images |
| Psathyrotopsis scaposa (A.Gray) H.Rob. | 1 images |
| Pseudabutilon umbellatum (L.) Fryxell | 2 images |
| Pseudognaphalium canescens (DC.) Anderb. | 1 images |
| Pseudognaphalium leucocephalum (A.Gray) Anderb. | 22 images |
| Pseudognaphalium luteoalbum (L.) Hilliard & B.L.Burtt | 1227 images |
| Pseudognaphalium obtusifolium (L.) Hilliard & B.L.Burtt | 68 images |
| Pseudognaphalium stramineum (Kunth) Anderb. | 103 images |
| Pseudognaphalium viscosum (Kunth) Anderb. | 4 images |
| Pseudotsuga menziesii (Mirb.) Franco | 4436 images |
| Psilactis asteroides A.Gray | 2 images |
| Psilostrophe sparsiflora (A.Gray) A.Nelson | 6 images |
| Psilostrophe tagetina (Nutt.) Greene | 12 images |
| Psilotum nudum (L.) P.Beauv. | 185 images |
| Ptelea trifoliata L. | 447 images |
| Pteris multifida Poir. | 14 images |
| Pteris vittata L. | 511 images |
| Pterocaulon virgatum (L.) DC. | 8 images |
| Pterospora andromedea Nutt. | 260 images |
| Ptilimnium nuttallii (DC.) Britton | 5 images |
| Puccinellia distans (Jacq.) Parl. | 95 images |
| Puccinellia parishii Hitchc. | 2 images |
| Pueraria montana (Lour.) Merr. | 382 images |
| Punica granatum L. | 13927 images |
| Purshia stansburiana (Torr.) Henrard | 18 images |
| Purshia tridentata (Pursh) DC. | 185 images |
| Pycnanthemum albescens Torr. & A.Gray | 2 images |
| Pycnanthemum muticum (Michx.) Pers. | 129 images |
| Pycnanthemum tenuifolium Schrad. | 249 images |
| Pycnanthemum verticillatum (Michx.) Pers. | 78 images |
| Pyracantha coccinea M.Roem. | 15634 images |
| Pyracantha crenulata (D.Don) M.Roem. | 1451 images |
| Pyracantha koidzumii (Hayata) Rehder | 723 images |
| Pyrola asarifolia Michx. | 113 images |
| Pyrola chlorantha Sw. | 327 images |
| Pyrola elliptica Nutt. | 144 images |
| Pyrola minor L. | 598 images |
| Pyrola picta Sm. | 124 images |
| Pyrrhopappus carolinianus (Walter) DC. | 267 images |
| Pyrrhopappus grandiflorus (Nutt.) Nutt. | 2 images |
| Pyrrhopappus pauciflorus DC. | 63 images |
| Pyrrocoma crocea (A.Gray) Greene | 25 images |
| Pyrrocoma lanceolata (Hook.) Greene | 1 images |
| Pyrus calleryana Decne. | 4611 images |
| Pyrus communis L. | 10533 images |
| Quercus × heterophylla F.Michx. | 6 images |
| Quercus alba L. | 751 images |
| Quercus arizonica Sarg. | 11 images |
| Quercus arkansana Sarg. | 15 images |
| Quercus boyntonii Beadle | 2 images |
| Quercus buckleyi Nixon & Dorr | 8 images |
| Quercus canbyi Trel. | 10 images |
| Quercus chrysolepis Liebm. | 151 images |
| Quercus emoryi Torr. | 19 images |
| Quercus falcata Michx. | 73 images |
| Quercus fusiformis Small | 184 images |
| Quercus gambelii Nutt. | 159 images |
| Quercus gravesii Sudw. | 17 images |
| Quercus grisea Liebm. | 15 images |
| Quercus havardii Rydb. | 7 images |
| Quercus hypoleucoides A.Camus | 3 images |
| Quercus imbricaria Michx. | 230 images |
| Quercus laurifolia Michx. | 57 images |
| Quercus lyrata Walter | 10 images |
| Quercus macrocarpa Michx. | 1304 images |
| Quercus marilandica (L.) Münchh. | 79 images |
| Quercus michauxii Nutt. | 160 images |
| Quercus muehlenbergii Engelm. | 63 images |
| Quercus nigra L. | 976 images |
| Quercus oblongifolia Torr. | 10 images |
| Quercus phellos L. | 791 images |
| Quercus polymorpha Schltdl. & Cham. | 43 images |
| Quercus pungens Liebm. | 3 images |
| Quercus rugosa Née | 30 images |
| Quercus shumardii Buckley | 74 images |
| Quercus similis Ashe | 1 images |
| Quercus sinuata Walter | 6 images |
| Quercus stellata Wangenh. | 131 images |
| Quercus texana Buckley | 38 images |
| Quercus toumeyi Sarg. | 7 images |
| Quercus turbinella Greene | 80 images |
| Quercus vaseyana Buckley | 8 images |
| Quercus velutina Lam. | 1241 images |
| Quercus virginiana Mill. | 489 images |
| Quincula lobata (Torr.) Raf. | 53 images |
| Rafinesquia neomexicana A.Gray | 83 images |
| Randia obcordata S.Watson | 1 images |
| Ranunculus abortivus L. | 513 images |
| Ranunculus acris L. | 12075 images |
| Ranunculus alismifolius Geyer ex Benth. | 55 images |
| Ranunculus arizonicus Lemmon. ex A.Gray | 2 images |
| Ranunculus cupulatus (S.Watson) Christenh. & Byng | 5 images |
| Ranunculus eschscholtzii Schltdl. | 24 images |
| Ranunculus fascicularis Muhl. ex Bigelow | 69 images |
| Ranunculus ficaria L. | 30809 images |
| Ranunculus flabellaris Raf. | 11 images |
| Ranunculus flammula L. | 1842 images |
| Ranunculus glaberrimus Hook. | 71 images |
| Ranunculus gmelinii DC. | 4 images |
| Ranunculus inamoenus Greene | 7 images |
| Ranunculus laxicaulis (Torr. & A.Gray) Darby | 1 images |
| Ranunculus macounii Britton | 11 images |
| Ranunculus macranthus Scheele | 5 images |
| Ranunculus minimus (L.) E.H.L.Krause | 175 images |
| Ranunculus muricatus L. | 1077 images |
| Ranunculus parviflorus Loefl. | 6 images |
| Ranunculus pensylvanicus L.f. | 2 images |
| Ranunculus petiolaris Humb., Bonpl. & Kunth ex DC. | 3 images |
| Ranunculus pusillus Poir. | 5 images |
| Ranunculus recurvatus Poir. | 229 images |
| Ranunculus repens L. | 15352 images |
| Ranunculus sardous Crantz | 939 images |
| Ranunculus sceleratus L. | 1449 images |
| Ranunculus trichophyllus Chaix | 507 images |
| Ranunculus trilobus Desf. | 68 images |
| Ranunculus uncinatus D.Don ex G.Don | 5 images |
| Raphanus raphanistrum L. | 13764 images |
| Rapistrum rugosum (L.) All. | 3131 images |
| Ratibida columnifera (Nutt.) Wooton & Standl. | 442 images |
| Reseda luteola L. | 3085 images |
| Rhamphospermum arvense (L.) Andrz. ex Besser | 10346 images |
| Rhamphospermum nigrum (L.) Al-Shehbaz | 767 images |
| Rhexia alifanus Walter | 14 images |
| Rhexia mariana L. | 199 images |
| Rhexia virginica L. | 114 images |
| Rhinanthus minor L. | 2859 images |
| Rhinotropis lindheimeri (A.Gray) J.R.Abbott | 1 images |
| Rhizophora mangle L. | 519 images |
| Rhodiola integrifolia Raf. | 76 images |
| Rhodiola rhodantha (A.Gray) H.Jacobsen | 9 images |
| Rhododendron canescens (Michx.) Sweet | 190 images |
| Rhododendron viscosum (L.) Torr. | 136 images |
| Rhododon ciliatus (Benth.) Epling | 4 images |
| Rhus aromatica Aiton | 659 images |
| Rhus copallinum L. | 907 images |
| Rhus glabra L. | 1779 images |
| Rhus microphylla Engelm. | 32 images |
| Rhus trilobata Nutt. | 16 images |
| Rhus virens Lindh. ex A.Gray | 45 images |
| Rhynchosia minima (L.) DC. | 301 images |
| Rhynchosia reniformis DC. | 1 images |
| Rhynchosida physocalyx (A.Gray) Fryxell | 19 images |
| Rhynchospora capitellata (Michx.) Vahl | 3 images |
| Rhynchospora colorata (L.) H.Pfeiff. | 139 images |
| Rhynchospora fascicularis (Michx.) Vahl | 8 images |
| Rhynchospora glomerata (L.) Vahl | 1 images |
| Rhynchospora latifolia (Baldwin ex Elliott) W.W.Thomas | 10 images |
| Rhynchospora nivea Boeckeler | 1 images |
| Rhynchospora perplexa Britton | 1 images |
| Ribes americanum Mill. | 119 images |
| Ribes aureum Pursh | 1720 images |
| Ribes cereum Douglas | 151 images |
| Ribes inerme Rydb. | 24 images |
| Ribes lacustre (Pers.) Poir. | 87 images |
| Ribes laxiflorum Pursh | 15 images |
| Ribes leptanthum A.Gray | 4 images |
| Ribes montigenum McClatchie | 30 images |
| Ribes viscosissimum Pursh | 24 images |
| Ribes wolfii Rothr. | 4 images |
| Richardia brasiliensis Gomes | 219 images |
| Richardia scabra L. | 573 images |
| Ricinus communis L. | 11068 images |
| Rivina humilis L. | 1042 images |
| Robinia hispida L. | 1459 images |
| Robinia neomexicana A.Gray | 31 images |
| Robinia pseudoacacia L. | 22249 images |
| Roldana hartwegii (Benth.) H.Rob. & Brettell | 3 images |
| Rorippa aquatica (Eaton) E.J.Palmer & Steyerm. | 1 images |
| Rorippa austriaca (Crantz) Besser | 172 images |
| Rorippa curvipes Greene | 10 images |
| Rorippa palustris (L.) Besser | 993 images |
| Rorippa sylvestris (L.) Besser | 2197 images |
| Rosa acicularis Lindl. | 25 images |
| Rosa arkansana Porter | 97 images |
| Rosa bracteata J.C.Wendl. | 35 images |
| Rosa canina L. | 21632 images |
| Rosa carolina L. | 32 images |
| Rosa gallica L. | 10921 images |
| Rosa laevigata Michx. | 58 images |
| Rosa lucieae Franch. & Rochebr. ex Crép. | 2767 images |
| Rosa micrantha Borrer ex Sm. | 1107 images |
| Rosa multiflora Thunb. | 5630 images |
| Rosa nutkana C.Presl | 16 images |
| Rosa rubiginosa L. | 4050 images |
| Rosa setigera Michx. | 339 images |
| Rosa stellata Wooton | 7 images |
| Rosa tomentosa Sm. | 232 images |
| Rosa woodsii Lindl. | 907 images |
| Rostraria cristata (L.) Tzvelev | 660 images |
| Rotala ramosior (L.) Koehne | 9 images |
| Rottboellia campestris Nutt. | 1 images |
| Rottboellia cochinchinensis (Lour.) Clayton | 26 images |
| Rubus argutus Link | 2167 images |
| Rubus deliciosus Torr. | 112 images |
| Rubus flagellaris Willd. | 37 images |
| Rubus idaeus L. | 7282 images |
| Rubus leucodermis (Douglas ex Hook.) Douglas ex Torr. & A.Gray | 2 images |
| Rubus pensilvanicus Poir. | 43 images |
| Rubus trivialis Michx. | 64 images |
| Rubus ulmifolius Schott | 11560 images |
| Rudbeckia amplexicaulis Vahl | 16 images |
| Rudbeckia fulgida Aiton | 7008 images |
| Rudbeckia grandiflora (Sweet) C.C.Gmel. ex DC. | 4 images |
| Rudbeckia hirta L. | 4759 images |
| Rudbeckia laciniata L. | 2449 images |
| Rudbeckia maxima Nutt. | 86 images |
| Rudbeckia missouriensis Engelm. ex C.L.Boynton & Beadle | 3 images |
| Rudbeckia subtomentosa Pursh | 112 images |
| Rudbeckia triloba L. | 1074 images |
| Ruellia caroliniensis (J.F.Gmel.) Steud. | 7 images |
| Ruellia ciliatiflora Hook. | 243 images |
| Ruellia drummondiana (Nees) A.Gray | 5 images |
| Ruellia humilis Nutt. | 521 images |
| Ruellia parryi A.Gray | 13 images |
| Ruellia pedunculata Torr. ex A.Gray | 33 images |
| Ruellia simplex C.Wright | 4050 images |
| Ruellia strepens L. | 132 images |
| Rumex × acutus L. | 1692 images |
| Rumex acetosella L. | 5262 images |
| Rumex altissimus Alph.Wood | 12 images |
| Rumex conglomeratus Murray | 2668 images |
| Rumex crispus L. | 9928 images |
| Rumex dentatus L. | 18 images |
| Rumex ellipticus Greene | 22 images |
| Rumex hymenosepalus Torr. | 89 images |
| Rumex maritimus L. | 93 images |
| Rumex obtusifolius L. | 12861 images |
| Rumex occidentalis S.Watson | 4 images |
| Rumex patientia L. | 3013 images |
| Rumex pulcher L. | 2182 images |
| Rumex spinosus L. | 383 images |
| Rumex stenophyllus Ledeb. | 1 images |
| Rumex venosus Pursh | 12 images |
| Rumex verticillatus L. | 30 images |
| Ruppia cirrhosa (Petagna) Grande | 33 images |
| Ruppia maritima L. | 23 images |
| Ruta chalepensis L. | 1343 images |
| Ruta graveolens L. | 3289 images |
| Sabal mexicana Mart. | 117 images |
| Sabal minor (Jacq.) Pers. | 287 images |
| Sabatia angularis (L.) Pursh | 161 images |
| Sabatia campanulata (L.) Torr. | 2 images |
| Sabatia campestris Nutt. | 134 images |
| Sabatia gentianoides Elliott | 8 images |
| Sabulina michauxii (Fenzl) Dillenb. & Kadereit | 6 images |
| Saccharum officinarum L. | 950 images |
| Sacciolepis indica (L.) Chase | 9 images |
| Sacciolepis striata (L.) Nash | 1 images |
| Sageretia thea (Osbeck) M.C.Johnst. | 81 images |
| Sagina saginoides (L.) H.Karst. | 72 images |
| Sagittaria graminea Michx. | 70 images |
| Sagittaria latifolia Willd. | 704 images |
| Sagittaria montevidensis Cham. & Schltdl. | 156 images |
| Salicornia bigelovii Torr. | 28 images |
| Salicornia rubra A.Nelson | 15 images |
| Salix × fragilis L. | 117 images |
| Salix × pendulina Wender. | 604 images |
| Salix amygdaloides Andersson | 25 images |
| Salix bebbiana Sarg. | 40 images |
| Salix bonplandiana Kunth | 8 images |
| Salix boothii Dorn | 1 images |
| Salix brachycarpa Nutt. | 1 images |
| Salix caroliniana Michx. | 33 images |
| Salix drummondiana Barratt ex Hook. | 2 images |
| Salix exigua Nutt. | 239 images |
| Salix geyeriana Andersson | 5 images |
| Salix glauca L. | 207 images |
| Salix gooddingii C.R.Ball | 5 images |
| Salix humilis Marshall | 14 images |
| Salix interior Rowlee | 7 images |
| Salix irrorata Andersson | 2 images |
| Salix laevigata Bebb | 37 images |
| Salix lasiandra Benth. | 3 images |
| Salix lasiolepis Benth. | 177 images |
| Salix lucida Muhl. | 63 images |
| Salix nigra Marshall | 130 images |
| Salix nivalis Hook. | 9 images |
| Salix petrophila Rydb. | 32 images |
| Salix planifolia Pursh | 7 images |
| Salix scouleriana Barratt ex Hook. | 20 images |
| Salsola tragus L. | 50 images |
| Salvia azurea Michx. ex Vahl | 82 images |
| Salvia ballotiflora Benth. | 21 images |
| Salvia coccinea Buc'hoz ex Etl. | 815 images |
| Salvia columbariae Benth. | 271 images |
| Salvia farinacea Benth. | 4970 images |
| Salvia greggii A.Gray | 583 images |
| Salvia hispanica L. | 717 images |
| Salvia lycioides A.Gray | 1 images |
| Salvia lyrata L. | 802 images |
| Salvia microphylla Kunth | 13369 images |
| Salvia pratensis L. | 16262 images |
| Salvia reflexa Hornem. | 30 images |
| Salvia regla Cav. | 37 images |
| Salvia roemeriana Scheele | 83 images |
| Salvia rosmarinus Spenn. | 17831 images |
| Salvia subincisa Benth. | 9 images |
| Salvia texana (Scheele) Torr. | 24 images |
| Salvia tiliifolia Vahl | 130 images |
| Salvia whitehousei Alziar | 3 images |
| Salvinia minima Baker | 56 images |
| Salvinia molesta D.Mitch. | 28 images |
| Sambucus canadensis L. | 4915 images |
| Sambucus cerulea Raf. | 9 images |
| Sambucus mexicana C.Presl ex DC. | 2 images |
| Sambucus racemosa L. | 8669 images |
| Samolus ebracteatus Kunth | 14 images |
| Samolus parviflorus Raf. | 2 images |
| Sanguinaria canadensis L. | 1649 images |
| Sanguisorba minor Scop. | 8810 images |
| Sanicula canadensis L. | 461 images |
| Sanicula marilandica L. | 29 images |
| Sanvitalia abertii A.Gray | 8 images |
| Sanvitalia procumbens Lam. | 1468 images |
| Saponaria officinalis L. | 15490 images |
| Sarcobatus vermiculatus (Hook.) Torr. | 45 images |
| Sarracenia alata (Alph.Wood) Alph.Wood | 7 images |
| Sassafras albidum (Nutt.) Nees | 1448 images |
| Satureja hortensis L. | 1269 images |
| Satureja montana L. | 3733 images |
| Saururus cernuus L. | 348 images |
| Saxifraga bronchialis L. | 55 images |
| Saxifraga cernua L. | 28 images |
| Saxifraga cespitosa L. | 84 images |
| Saxifraga chrysantha A.Gray | 3 images |
| Saxifraga hirculus L. | 114 images |
| Scabiosa atropurpurea L. | 5159 images |
| Scabrethia scabra (Hook.) W.A.Weber | 13 images |
| Scaevola plumieri (L.) Vahl | 258 images |
| Scaevola taccada (Gaertn.) Roxb. | 1029 images |
| Scandix pecten-veneris L. | 2753 images |
| Schaefferia cuneifolia A.Gray | 3 images |
| Schinus longifolia (Lindl.) Speg. | 53 images |
| Schinus molle L. | 6241 images |
| Schinus terebinthifolia Raddi | 2394 images |
| Schismus arabicus Nees | 14 images |
| Schismus barbatus (L.) Thell. | 18 images |
| Schizachyrium scoparium (Michx.) Nash | 50 images |
| Schkuhria pinnata (Lam.) Kuntze ex Thell. | 53 images |
| Schoenocaulon texanum Scheele | 6 images |
| Schoenolirion croceum (Michx.) Alph.Wood | 5 images |
| Schoenoplectiella hallii (A.Gray) Lye | 1 images |
| Schoenoplectus californicus (C.A.Mey.) Soják | 37 images |
| Schoenoplectus pungens (Vahl) Palla | 60 images |
| Schoenoplectus tabernaemontani (C.C.Gmel.) Palla | 82 images |
| Schoenus nigricans L. | 392 images |
| Scilla hyacinthoides L. | 187 images |
| Scirpus atrovirens Willd. | 182 images |
| Scirpus cyperinus (L.) Kunth | 111 images |
| Scirpus microcarpus J.Presl & C.Presl | 4 images |
| Scirpus pendulus Muhl. | 30 images |
| Sclerocactus brevihamatus (Engelm.) D.R.Hunt | 1 images |
| Sclerocactus cloverae K.D.Heil & J.M.Porter | 1 images |
| Sclerocactus mariposensis (Hester) N.P.Taylor | 4 images |
| Sclerocactus papyracanthus (Engelm.) N.P.Taylor | 7 images |
| Sclerocactus parviflorus Clover & Jotter | 21 images |
| Sclerocactus scheeri (Salm-Dyck) N.P.Taylor | 1 images |
| Sclerocactus warnockii (L.D.Benson) N.P.Taylor | 7 images |
| Sclerochloa dura (L.) P.Beauv. | 60 images |
| Scoparia dulcis L. | 286 images |
| Scorzonera laciniata L. | 622 images |
| Scrophularia lanceolata Pursh | 14 images |
| Scrophularia marilandica L. | 50 images |
| Scrophularia montana Wooton | 2 images |
| Scutellaria brittonii Porter | 2 images |
| Scutellaria drummondii Benth. | 51 images |
| Scutellaria galericulata L. | 1231 images |
| Scutellaria integrifolia L. | 87 images |
| Scutellaria lateriflora L. | 89 images |
| Scutellaria mexicana (Torr.) A.J.Paton | 16 images |
| Scutellaria minor Huds. | 125 images |
| Scutellaria muriculata Epling | 1 images |
| Scutellaria ovata Hill | 78 images |
| Scutellaria parvula Michx. | 34 images |
| Scutellaria racemosa Pers. | 52 images |
| Scutellaria wrightii A.Gray | 1 images |
| Secale cereale L. | 3452 images |
| Sedum cockerellii Britton | 2 images |
| Sedum diffusum S.Watson | 18 images |
| Sedum havardii Rose | 1 images |
| Sedum lanceolatum Torr. | 84 images |
| Sedum pulchellum Michx. | 49 images |
| Sedum stelliforme S.Watson | 10 images |
| Sedum wrightii A.Gray | 5 images |
| Selaginella apoda (L.) Spring | 14 images |
| Selaginella lepidophylla (Hook. & Grev.) Spring | 98 images |
| Selenicereus spinulosus (DC.) Britton & Rose | 5 images |
| Senecio ampullaceus Hook. | 309 images |
| Senecio atratus Greene | 31 images |
| Senecio bigelovii A.Gray | 10 images |
| Senecio eremophilus Richardson | 2 images |
| Senecio flaccidus Less. | 141 images |
| Senecio integerrimus Nutt. | 145 images |
| Senecio riddellii Torr. & A.Gray | 4 images |
| Senecio soldanella A.Gray | 3 images |
| Senecio spartioides Torr. & A.Gray | 19 images |
| Senecio taraxacoides Greene | 1 images |
| Senecio triangularis Hook. | 276 images |
| Senecio vulgaris L. | 9344 images |
| Senecio warnockii Shinners | 2 images |
| Senecio wootonii Greene | 10 images |
| Senegalia berlandieri (Benth.) Britton & Rose | 32 images |
| Senegalia roemeriana (Scheele) Britton & Rose | 1 images |
| Senna corymbosa (Lam.) H.S.Irwin & Barneby | 721 images |
| Senna hirsuta (L.) H.S.Irwin & Barneby | 58 images |
| Senna marilandica (L.) Link | 191 images |
| Senna obtusifolia (L.) H.S.Irwin & Barneby | 428 images |
| Senna occidentalis (L.) Link | 1365 images |
| Senna pendula (Humb. & Bonpl. ex Willd.) H.S.Irwin & Barneby | 277 images |
| Sesamum indicum L. | 364 images |
| Sesbania drummondii (Rydb.) Cory | 81 images |
| Sesbania herbacea (Mill.) McVaugh | 107 images |
| Sesbania punicea (Cav.) Benth. | 419 images |
| Sesbania vesicaria (Jacq.) Elliott | 8 images |
| Sesuvium portulacastrum (L.) L. | 872 images |
| Sesuvium revolutifolium Ortega | 40 images |
| Setaria adhaerens (Forssk.) Chiov. | 12 images |
| Setaria geminata (Forssk.) Veldkamp | 12 images |
| Setaria italica (L.) P.Beauv. | 1308 images |
| Setaria leucopila (Scribn. & Merr.) K.Schum. | 3 images |
| Setaria macrostachya Kunth | 5 images |
| Setaria magna Griseb. | 4 images |
| Setaria parviflora (Poir.) Kerguélen | 161 images |
| Setaria pumila (Poir.) Roem. & Schult. | 2523 images |
| Setaria scheelei (Steud.) Hitchc. | 7 images |
| Setaria verticillata (L.) P.Beauv. | 1214 images |
| Setaria viridis (L.) P.Beauv. | 150 images |
| Setaria vulpiseta (Lam.) Roem. & Schult. | 12 images |
| Seymeria bipinnatisecta Seem. | 4 images |
| Seymeria cassioides (J.F.Gmel.) S.F.Blake | 4 images |
| Shepherdia argentea (Pursh) Nutt. | 52 images |
| Shepherdia canadensis (L.) Nutt. | 150 images |
| Sibbaldia procumbens L. | 174 images |
| Sicyos angulatus L. | 407 images |
| Sicyos glaber Wooton | 5 images |
| Sicyos microphyllus Kunth | 8 images |
| Sida ciliaris L. | 104 images |
| Sida cordifolia L. | 178 images |
| Sida rhombifolia L. | 788 images |
| Sida spinosa L. | 152 images |
| Sidalcea candida A.Gray | 20 images |
| Sidalcea neomexicana A.Gray | 25 images |
| Sidastrum paniculatum (L.) Fryxell | 10 images |
| Sideritis lanata L. | 6 images |
| Sideroxylon lanuginosum Michx. | 93 images |
| Sideroxylon lycioides L. | 16 images |
| Silene acaulis (L.) Jacq. | 2696 images |
| Silene antirrhina L. | 14 images |
| Silene conoidea L. | 14 images |
| Silene csereii Baumg. | 4 images |
| Silene dichotoma Ehrh. | 1219 images |
| Silene gallica L. | 1783 images |
| Silene laciniata Cav. | 249 images |
| Silene latifolia Poir. | 19644 images |
| Silene noctiflora L. | 1505 images |
| Silene scouleri Hook. | 2 images |
| Silene stellata (L.) Coyte | 123 images |
| Silene vulgaris (Moench) Garcke | 14924 images |
| Silphium albiflorum A.Gray | 12 images |
| Silphium asteriscus L. | 73 images |
| Silphium integrifolium Michx. | 100 images |
| Silphium laciniatum L. | 232 images |
| Silphium perfoliatum L. | 1351 images |
| Silphium radula Nutt. | 33 images |
| Silybum marianum (L.) Gaertn. | 9297 images |
| Simmondsia chinensis (Link) C.K.Schneid. | 16 images |
| Sinapis alba L. | 6259 images |
| Sisymbrium altissimum L. | 340 images |
| Sisymbrium irio L. | 2445 images |
| Sisymbrium loeselii L. | 1396 images |
| Sisymbrium officinale (L.) Scop. | 5899 images |
| Sisymbrium orientale L. | 328 images |
| Sisymbrium polyceratium L. | 10 images |
| Sisyrinchium albidum Raf. | 38 images |
| Sisyrinchium angustifolium Mill. | 963 images |
| Sisyrinchium idahoense E.P.Bicknell | 7 images |
| Sisyrinchium langloisii Greene | 56 images |
| Sisyrinchium minus Engelm. & A.Gray | 4 images |
| Sisyrinchium montanum Greene | 169 images |
| Sisyrinchium rosulatum E.P.Bicknell | 260 images |
| Sium suave Walter | 65 images |
| Smallanthus uvedalia (L.) Mack. | 63 images |
| Smilax bona-nox L. | 742 images |
| Smilax glauca Walter | 60 images |
| Smilax lasioneura Hook. | 13 images |
| Smilax laurifolia L. | 44 images |
| Smilax pumila Walter | 20 images |
| Smilax rotundifolia L. | 849 images |
| Smilax tamnoides L. | 172 images |
| Smilax walteri Pursh | 16 images |
| Solanum alatum Moench | 3 images |
| Solanum americanum Mill. | 5613 images |
| Solanum campechiense L. | 10 images |
| Solanum capsicoides All. | 82 images |
| Solanum carolinense L. | 1505 images |
| Solanum citrullifolium A.Braun | 17 images |
| Solanum dimidiatum Raf. | 172 images |
| Solanum diphyllum L. | 427 images |
| Solanum douglasii Dunal | 150 images |
| Solanum dulcamara L. | 13734 images |
| Solanum elaeagnifolium Cav. | 1566 images |
| Solanum erianthum D.Don | 2 images |
| Solanum heterodoxum Dunal | 20 images |
| Solanum lycopersicum L. | 15816 images |
| Solanum nigrescens M.Martens & Galeotti | 21 images |
| Solanum nigrum L. | 12801 images |
| Solanum pseudocapsicum L. | 3028 images |
| Solanum rostratum Dunal | 540 images |
| Solanum sarrachoides Sendtn. | 5 images |
| Solanum sisymbriifolium Lam. | 986 images |
| Solanum stoloniferum Schltdl. | 4 images |
| Solanum triflorum Nutt. | 57 images |
| Solanum triquetrum Cav. | 21 images |
| Solidago altissima L. | 533 images |
| Solidago arguta Aiton | 6 images |
| Solidago caesia L. | 417 images |
| Solidago canadensis L. | 13589 images |
| Solidago gigantea Aiton | 6132 images |
| Solidago missouriensis Nutt. | 23 images |
| Solidago mollis Bartl. | 5 images |
| Solidago multiradiata Aiton | 32 images |
| Solidago nemoralis Aiton | 160 images |
| Solidago odora Aiton | 52 images |
| Solidago patula Muhl. ex Willd. | 23 images |
| Solidago petiolaris Aiton | 10 images |
| Solidago rigida L. | 153 images |
| Solidago rugosa Mill. | 1033 images |
| Solidago simplex Kunth | 16 images |
| Solidago ulmifolia Muhl. ex Willd. | 65 images |
| Solidago velutina DC. | 89 images |
| Soliva sessilis Ruiz & Pav. | 155 images |
| Soliva stolonifera (Brot.) Loudon | 4 images |
| Sonchus asper (L.) Hill | 13486 images |
| Sonchus oleraceus L. | 13459 images |
| Sophora stenophylla A.Gray | 1 images |
| Sophora tomentosa L. | 223 images |
| Sorbus scopulina Greene | 51 images |
| Sorghastrum nutans (L.) Nash | 173 images |
| Sorghum × drummondii (Nees ex Steud.) Millsp. & Chase | 3 images |
| Sorghum bicolor (L.) Moench | 2114 images |
| Sorghum halepense (L.) Pers. | 2807 images |
| Sparganium americanum Nutt. | 14 images |
| Sparganium androcladum (Engelm.) Morong | 3 images |
| Sparganium angustifolium Michx. | 266 images |
| Sparganium emersum Rehmann | 187 images |
| Sparganium eurycarpum Engelm. | 48 images |
| Spartium junceum L. | 6271 images |
| Spergula arvensis L. | 1163 images |
| Spergularia echinosperma (Čelak.) Asch. & Graebn. | 31 images |
| Spergularia marina (L.) Besser | 601 images |
| Spergularia media (L.) C.Presl | 314 images |
| Spergularia rubra (L.) J.Presl & C.Presl | 1429 images |
| Spermacoce glabra Michx. | 31 images |
| Spermacoce remota Lam. | 170 images |
| Sphaeralcea angustifolia (Cav.) G.Don | 24 images |
| Sphaeralcea coccinea (Nutt.) Rydb. | 159 images |
| Sphaeralcea emoryi Torr. ex A.Gray | 13 images |
| Sphaeralcea fendleri A.Gray | 5 images |
| Sphaeralcea hastulata A.Gray | 25 images |
| Sphaeralcea incana Torr. ex A.Gray | 19 images |
| Sphaeralcea lindheimeri A.Gray | 2 images |
| Sphaeralcea parvifolia A.Nelson | 19 images |
| Sphaeralcea pedatifida (A.Gray) A.Gray | 4 images |
| Sphaerophysa salsula (Pall.) DC. | 16 images |
| Sphenoclea zeylanica Gaertn. | 21 images |
| Sphenopholis intermedia (Rydb.) Rydb. | 9 images |
| Sphenopholis obtusata (Michx.) Scribn. | 9 images |
| Spigelia hedyotidea A.DC. | 1 images |
| Spigelia marilandica (L.) L. | 170 images |
| Spiranthes brevilabris Lindl. | 1 images |
| Spiranthes cernua (L.) Rich. | 159 images |
| Spiranthes lacera (Raf.) Raf. | 64 images |
| Spiranthes longilabris Lindl. | 1 images |
| Spiranthes magnicamporum Sheviak | 26 images |
| Spiranthes odorata (Nutt.) Lindl. | 3 images |
| Spiranthes ovalis Lindl. | 26 images |
| Spiranthes praecox (Walter) S.Watson | 6 images |
| Spiranthes romanzoffiana Cham. | 90 images |
| Spiranthes tuberosa Raf. | 3 images |
| Spiranthes vernalis Engelm. & A.Gray | 60 images |
| Spirodela polyrhiza (L.) Schleid. | 184 images |
| Sporobolus airoides (Torr.) Torr. | 24 images |
| Sporobolus alopecuroides (Piller & Mitterp.) P.M.Peterson | 55 images |
| Sporobolus alterniflorus (Loisel.) P.M.Peterson & Saarela | 60 images |
| Sporobolus bakeri (Merr.) P.M.Peterson & Saarela | 1 images |
| Sporobolus cryptandrus (Torr.) A.Gray | 9 images |
| Sporobolus cynosuroides (L.) P.M.Peterson & Saarela | 1 images |
| Sporobolus heterolepis (A.Gray) A.Gray | 14 images |
| Sporobolus hookerianus P.M.Peterson & Saarela | 4 images |
| Sporobolus indicus (L.) R.Br. | 396 images |
| Sporobolus michauxianus (Hitchc.) P.M.Peterson & Saarela | 63 images |
| Sporobolus neglectus Nash | 2 images |
| Sporobolus pumilus (Roth) P.M.Peterson & Saarela | 47 images |
| Sporobolus pyramidatus (Lam.) Hitchc. | 4 images |
| Sporobolus rigidus (Buckley) P.M.Peterson | 7 images |
| Sporobolus schoenoides (L.) P.M.Peterson | 88 images |
| Sporobolus vaginiflorus (Torr. ex A.Gray) Alph.Wood | 8 images |
| Sporobolus virginicus (L.) Kunth | 27 images |
| Stachys arvensis (L.) L. | 602 images |
| Stachys coccinea Ortega | 41 images |
| Stachys drummondii Benth. | 5 images |
| Stachys floridana Shuttlew. ex Benth. | 108 images |
| Stachys pilosa Nutt. | 16 images |
| Stachys tenuifolia Willd. | 10 images |
| Stanleya pinnata (Pursh) Britton | 96 images |
| Stanleya viridiflora Nutt. | 3 images |
| Stapfochloa ciliata (Sw.) P.M.Peterson | 3 images |
| Steinchisma hians (Elliott) Nash | 4 images |
| Stellaria apetala Ucria | 193 images |
| Stellaria crassifolia Ehrh. | 20 images |
| Stellaria cuspidata Willd. ex D.F.K.Schltdl. | 10 images |
| Stellaria longifolia Muhl. ex Willd. | 11 images |
| Stellaria longipes Goldie | 22 images |
| Stellaria media (L.) Vill. | 12314 images |
| Stellaria nitens Nutt. | 5 images |
| Stenandrium barbatum Torr. & A.Gray | 7 images |
| Stenandrium dulce (Cav.) Nees | 13 images |
| Stenanthium gramineum (Ker Gawl.) Morong | 18 images |
| Stenaria nigricans (Lam.) Terrell | 105 images |
| Stenotaphrum secundatum (Walter) Kuntze | 491 images |
| Stenotus armerioides Nutt. | 14 images |
| Stephanomeria exigua Nutt. | 15 images |
| Stevia micrantha Lag. | 8 images |
| Stevia serrata Cav. | 23 images |
| Stevia viscida Kunth | 24 images |
| Stewartia malacodendron L. | 41 images |
| Stillingia sylvatica L. | 32 images |
| Streptanthus bracteatus A.Gray | 1 images |
| Streptanthus cordatus Nutt. | 7 images |
| Streptanthus platycarpus A.Gray | 1 images |
| Streptopus amplexifolius (L.) DC. | 546 images |
| Strigosella africana (L.) Botsch. | 164 images |
| Strophostyles helvola (L.) Elliott | 74 images |
| Stuckenia filiformis (Pers.) Börner | 5 images |
| Stuckenia pectinata (L.) Börner | 105 images |
| Stuckenia striata (Ruiz & Pav.) Holub | 2 images |
| Stylisma villosa (Nash) House | 1 images |
| Styrax americanus Lam. | 25 images |
| Styrax grandifolius Aiton | 3 images |
| Suaeda linearis (Elliott) Moq. | 3 images |
| Swertia perennis L. | 592 images |
| Symphoricarpos albus (L.) S.F.Blake | 9803 images |
| Symphoricarpos longiflorus A.Gray | 22 images |
| Symphoricarpos occidentalis (R.Br.) Hook. | 57 images |
| Symphoricarpos orbiculatus Moench | 3107 images |
| Symphoricarpos oreophilus A.Gray | 9 images |
| Symphoricarpos rotundifolius A.Gray | 42 images |
| Symphyotrichum drummondii (Lindl.) G.L.Nesom | 1 images |
| Symphyotrichum dumosum (L.) G.L.Nesom | 54 images |
| Symphyotrichum ericoides (L.) G.L.Nesom | 1521 images |
| Symphyotrichum foliaceum (Lindl. ex DC.) G.L.Nesom | 1 images |
| Symphyotrichum laeve (L.) Á.Löve & D.Löve | 178 images |
| Symphyotrichum lanceolatum (Willd.) G.L.Nesom | 2891 images |
| Symphyotrichum lateriflorum (L.) Á.Löve & D.Löve | 64 images |
| Symphyotrichum novae-angliae (L.) G.L.Nesom | 2539 images |
| Symphyotrichum oblongifolium (Nutt.) G.L.Nesom | 44 images |
| Symphyotrichum ontarionis (Wiegand) G.L.Nesom | 7 images |
| Symphyotrichum oolentangiense (Riddell) G.L.Nesom | 215 images |
| Symphyotrichum patens (Aiton) G.L.Nesom | 2 images |
| Symphyotrichum praealtum (Poir.) G.L.Nesom | 5 images |
| Symphyotrichum puniceum (L.) Á.Löve & D.Löve | 101 images |
| Symphyotrichum racemosum (Elliott) G.L.Nesom | 7 images |
| Symphyotrichum sericeum (Vent.) G.L.Nesom | 10 images |
| Symphyotrichum subulatum (Michx.) G.L.Nesom | 724 images |
| Symphytum officinale L. | 19376 images |
| Symplocos tinctoria (L.) L'Hér. | 5 images |
| Synthlipsis greggii A.Gray | 5 images |
| Syringa vulgaris L. | 20294 images |
| Syringodium filiforme Kütz. | 4 images |
| Taenidia integerrima (L.) Drude | 47 images |
| Tagetes micrantha Cav. | 7 images |
| Talinum fruticosum (L.) Juss. | 449 images |
| Talinum paniculatum (Jacq.) Gaertn. | 1752 images |
| Tamarindus indica L. | 1562 images |
| Tamarix africana Poir. | 502 images |
| Tamarix aphylla (L.) H.Karst. | 174 images |
| Tamarix canariensis Willd. | 525 images |
| Tamarix chinensis Lour. | 170 images |
| Tamarix gallica L. | 5939 images |
| Tamarix parviflora DC. | 3145 images |
| Tamarix ramosissima Ledeb. | 1561 images |
| Tanacetum vulgare L. | 16857 images |
| Taraxacum erythrospermum Andrz. ex Besser | 1109 images |
| Taraxacum sect. Taraxacum F.H.Wigg. | 14318 images |
| Taxodium distichum (L.) Rich. | 8298 images |
| Tecoma stans (L.) Juss. ex Kunth | 5407 images |
| Telesonix jamesii (Torr.) Raf. | 10 images |
| Tephrosia onobrychoides Nutt. | 2 images |
| Tephrosia vicioides Schltdl. | 23 images |
| Tephrosia virginiana (L.) Pers. | 74 images |
| Tetradymia canescens DC. | 85 images |
| Tetradymia filifolia Greene | 23 images |
| Tetragonotheca repanda Small | 1 images |
| Tetramerium nervosum Nees | 36 images |
| Tetraneuris acaulis Greene | 25 images |
| Tetraneuris argentea Greene | 1 images |
| Tetraneuris ivesiana Greene | 3 images |
| Tetraneuris linearifolia Greene | 25 images |
| Tetraneuris scaposa (DC.) Greene | 126 images |
| Tetrapogon chlorideus (J.Presl) P.M.Peterson | 1 images |
| Teucrium canadense L. | 562 images |
| Teucrium laciniatum Torr. | 24 images |
| Thalassia testudinum Banks & Sol. ex K.D.Koenig | 7 images |
| Thalia dealbata Fraser | 323 images |
| Thalictrum alpinum L. | 62 images |
| Thalictrum dasycarpum Fisch., C.A.Mey. & Avé-Lall. | 9 images |
| Thalictrum fendleri Engelm. ex A.Gray | 58 images |
| Thalictrum revolutum DC. | 24 images |
| Thalictrum venulosum Trel. | 1 images |
| Thaspium barbinode (Michx.) Nutt. | 35 images |
| Thaspium trifoliatum (L.) A.Gray | 22 images |
| Thelesperma filifolium (Hook.) A.Gray | 4 images |
| Thelesperma megapotamicum (Spreng.) Herter | 43 images |
| Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose | 23 images |
| Thelocactus setispinus (Engelm.) E.F.Anderson | 111 images |
| Thelypodium integrifolium (Nutt.) Endl. | 2 images |
| Thelypteris dentata (Forssk.) E.P.St.John | 225 images |
| Thelypteris hispidula (Decne.) C.F.Reed | 17 images |
| Thelypteris kunthii (Desv.) C.V.Morton | 8 images |
| Thelypteris palustris Schott | 329 images |
| Thermopsis montana Nutt. | 9 images |
| Thinopyrum acutum (DC.) Banfi | 52 images |
| Thinopyrum elongatum (Host) D.R.Dewey | 21 images |
| Thinopyrum intermedium (Host) Barkworth & D.R.Dewey | 19 images |
| Thlaspi arvense L. | 2711 images |
| Thunbergia alata Bojer ex Sims | 3765 images |
| Thurovia triflora Rose | 4 images |
| Thymelaea passerina (L.) Coss. & Germ. | 65 images |
| Thymophylla acerosa (DC.) Strother | 13 images |
| Thymophylla micropoides (DC.) Strother | 1 images |
| Thymophylla pentachaeta (DC.) Small | 91 images |
| Thymophylla setifolia Lag. | 7 images |
| Thymophylla tenuiloba (DC.) Small | 58 images |
| Thysanocarpus curvipes Hook. | 70 images |
| Tidestromia lanuginosa (Nutt.) Standl. | 25 images |
| Tidestromia suffruticosa (Torr.) Standl. | 10 images |
| Tilia americana L. | 4493 images |
| Tillandsia baileyi Rose ex Small | 9 images |
| Tillandsia recurvata (L.) L. | 479 images |
| Tillandsia usneoides (L.) L. | 842 images |
| Tinantia anomala (Torr.) C.B.Clarke | 3 images |
| Tipularia discolor (Pursh) Nutt. | 328 images |
| Tiquilia mexicana (S.Watson) A.T.Richardson | 8 images |
| Tithonia diversifolia (Hemsl.) A.Gray | 1425 images |
| Tomostima cuneifolia (Nutt.) Al-Shehbaz, M.Koch & Jordon-Thaden | 1 images |
| Torenia crustacea (L.) Cham. & Schltdl. | 146 images |
| Torilis arvensis (Huds.) Link | 4666 images |
| Torilis japonica (Houtt.) DC. | 1438 images |
| Torilis nodosa (L.) Gaertn. | 925 images |
| Torreyochloa pallida (Torr.) Church | 10 images |
| Townsendia exscapa (Richardson) Porter | 11 images |
| Townsendia fendleri A.Gray | 2 images |
| Townsendia formosa Greene | 1 images |
| Townsendia incana Nutt. | 9 images |
| Toxicodendron pubescens Mill. | 53 images |
| Toxicodendron radicans (L.) Kuntze | 4907 images |
| Toxicodendron rydbergii (Small ex Rydb.) Greene | 127 images |
| Toxicodendron vernix (L.) Kuntze | 67 images |
| Toxicoscordion paniculatum (Nutt.) Rydb. | 21 images |
| Toxicoscordion venenosum (S.Watson) Rydb. | 43 images |
| Trachypogon spicatus (L.f.) Kuntze | 10 images |
| Tradescantia brevifolia (Torr.) Rose | 17 images |
| Tradescantia buckleyi (I.M.Johnst.) D.R.Hunt | 1 images |
| Tradescantia crassifolia Cav. | 24 images |
| Tradescantia gigantea Rose | 19 images |
| Tradescantia hirsutiflora Bush | 7 images |
| Tradescantia occidentalis (Britton) Smyth | 106 images |
| Tradescantia ohiensis Raf. | 882 images |
| Tradescantia pinetorum Greene | 5 images |
| Tradescantia reverchonii Bush | 21 images |
| Tragia cordata Michx. | 13 images |
| Tragia ramosa Torr. | 38 images |
| Tragia urticifolia Michx. | 14 images |
| Tragopogon dubius Scop. | 6056 images |
| Tragopogon porrifolius L. | 4920 images |
| Tragopogon pratensis L. | 8315 images |
| Tragus berteronianus Schult. | 75 images |
| Trautvetteria caroliniensis (Walter) Vail | 34 images |
| Triadica sebifera (L.) Small | 627 images |
| Triantha racemosa (Walter) Small | 1 images |
| Trianthema portulacastrum L. | 279 images |
| Tribulus terrestris L. | 2120 images |
| Trichostema brachiatum L. | 24 images |
| Trichostema dichotomum L. | 125 images |
| Trichostema setaceum Houtt. | 4 images |
| Tridax procumbens L. | 508 images |
| Tridens albescens (Vasey) Wooton & Standl. | 5 images |
| Tridens flavus (L.) Hitchc. | 62 images |
| Tridens strictus (Nutt.) Nash | 2 images |
| Tridentopsis mutica (Torr.) P.M.Peterson | 3 images |
| Trifolium attenuatum Greene | 4 images |
| Trifolium campestre Schreb. | 4023 images |
| Trifolium dubium Sibth. | 3374 images |
| Trifolium fragiferum L. | 1137 images |
| Trifolium hybridum L. | 1491 images |
| Trifolium lappaceum L. | 191 images |
| Trifolium nanum Torr. | 9 images |
| Trifolium pratense L. | 17823 images |
| Trifolium reflexum L. | 3 images |
| Trifolium repens L. | 12289 images |
| Trifolium wormskioldii Lehm. | 53 images |
| Triglochin maritima L. | 361 images |
| Triglochin palustris L. | 141 images |
| Trillium pusillum Michx. | 3 images |
| Trillium recurvatum L.C.Beck | 11 images |
| Trillium viridescens Nutt. | 6 images |
| Triodanis perfoliata (L.) Nieuwl. | 584 images |
| Triosteum angustifolium L. | 9 images |
| Triosteum perfoliatum L. | 50 images |
| Triphasia trifolia (Burm.f.) P.Wilson | 67 images |
| Triphora trianthophoros (Sw.) Rydb. | 9 images |
| Tripidium ravennae (L.) H.Scholz | 89 images |
| Triplasis purpurea (Walter) Chapm. | 3 images |
| Tripsacum dactyloides (L.) L. | 77 images |
| Triticum aestivum L. | 21438 images |
| Trixis californica Kellogg | 40 images |
| Trixis inula Crantz | 24 images |
| Turnera diffusa Willd. ex Schult. | 70 images |
| Turritis glabra L. | 939 images |
| Typha × glauca Godr. | 49 images |
| Typha angustifolia L. | 1005 images |
| Typha domingensis Pers. | 214 images |
| Typha latifolia L. | 3376 images |
| Ulmus alata Michx. | 513 images |
| Ulmus americana L. | 4449 images |
| Ulmus crassifolia Nutt. | 198 images |
| Ulmus pumila L. | 2963 images |
| Ulmus rubra Muhl. | 140 images |
| Ulmus serotina Sarg. | 29 images |
| Ungnadia speciosa Endl. | 116 images |
| Uniola paniculata L. | 83 images |
| Urochloa brizantha (A.Rich.) R.D.Webster | 4 images |
| Urochloa fusca (Sw.) B.F.Hansen & Wunderlin | 16 images |
| Urochloa mutica (Forssk.) T.Q.Nguyen | 10 images |
| Urochloa plantaginea (Link) R.D.Webster | 1 images |
| Urochloa polystachya (Kunth) Mabb. | 8 images |
| Urochloa ramosa (L.) T.Q.Nguyen | 7 images |
| Urochloa reptans (L.) Stapf | 4 images |
| Urochloa subquadripara (Trin.) R.D.Webster | 4 images |
| Urochloa trichopus (Hochst.) Stapf | 12 images |
| Urtica chamaedryoides Pursh | 42 images |
| Urtica gracilenta Greene | 10 images |
| Urtica gracilis Aiton | 1 images |
| Urtica urens L. | 4220 images |
| Urvillea ulmacea Kunth | 25 images |
| Utricularia foliosa L. | 33 images |
| Utricularia gibba L. | 46 images |
| Utricularia inflata Walter | 2 images |
| Utricularia juncea Vahl | 4 images |
| Utricularia purpurea Walter | 12 images |
| Utricularia radiata Small | 12 images |
| Utricularia striata Leconte ex Torr. | 8 images |
| Utricularia subulata L. | 33 images |
| Uvularia perfoliata L. | 75 images |
| Uvularia sessilifolia L. | 135 images |
| Vaccinium arboreum Marshall | 189 images |
| Vaccinium cespitosum Michx. | 3 images |
| Vaccinium corymbosum L. | 2491 images |
| Vaccinium myrtillus L. | 5465 images |
| Vaccinium scoparium Leiberg ex Coville | 26 images |
| Vaccinium stamineum L. | 166 images |
| Vachellia constricta (Benth.) Seigler & Ebinger | 3 images |
| Vachellia farnesiana (L.) Wight & Arn. | 1456 images |
| Vachellia rigidula (Benth.) Seigler & Ebinger | 31 images |
| Vachellia seyal (Delile) P.J.H.Hurter | 161 images |
| Valeriana acutiloba Rydb. | 2 images |
| Valeriana occidentalis A.Heller | 7 images |
| Valeriana woodsiana (Torr. & A.Gray) Christenh. & Byng | 159 images |
| Vallisneria americana Michx. | 8 images |
| Veratrum californicum Durand | 146 images |
| Verbascum blattaria L. | 3285 images |
| Verbascum thapsus L. | 16324 images |
| Verbascum virgatum Stokes | 1443 images |
| Verbena bipinnatifida Schauer | 402 images |
| Verbena bracteata Cav. ex Lag. & Rodr. | 40 images |
| Verbena brasiliensis Vell. | 735 images |
| Verbena canadensis (L.) Britton | 142 images |
| Verbena canescens Kunth | 18 images |
| Verbena chiricahensis (Umber) Moldenke | 1 images |
| Verbena cloverae Moldenke | 3 images |
| Verbena gooddingii Briq. | 49 images |
| Verbena halei Small | 180 images |
| Verbena hastata L. | 1030 images |
| Verbena incompta P.W.Michael | 5 images |
| Verbena macdougalii A.Heller | 18 images |
| Verbena menthifolia Benth. | 12 images |
| Verbena officinalis L. | 7341 images |
| Verbena perennis Wooton | 2 images |
| Verbena polyantha (Umber) Moldenke | 2 images |
| Verbena pumila Rydb. | 33 images |
| Verbena rigida Spreng. | 1640 images |
| Verbena stricta Vent. | 321 images |
| Verbena tenera Spreng. | 297 images |
| Verbena urticifolia L. | 785 images |
| Verbena xutha Lehm. | 4 images |
| Verbesina alternifolia (L.) Britton ex Kearney | 570 images |
| Verbesina encelioides (Cav.) Benth. & Hook.f. ex A.Gray | 479 images |
| Verbesina helianthoides Michx. | 22 images |
| Verbesina microptera DC. | 42 images |
| Verbesina occidentalis Walter | 181 images |
| Verbesina virginica L. | 362 images |
| Verbesina walteri Shinners | 8 images |
| Vernicia fordii (Hemsl.) Airy Shaw | 66 images |
| Vernonia baldwinii Torr. | 673 images |
| Vernonia gigantea (Walter) Trel. | 13 images |
| Vernonia lindheimeri A.Gray & Engelm. | 2 images |
| Vernonia marginata (Torr.) Raf. | 10 images |
| Vernonia missurica Raf. | 23 images |
| Vernonia texana (A.Gray) Small | 7 images |
| Veronica agrestis L. | 1507 images |
| Veronica anagallis-aquatica L. | 1561 images |
| Veronica arvensis L. | 3162 images |
| Veronica catenata Pennell | 109 images |
| Veronica peregrina L. | 335 images |
| Veronica persica Poir. | 14403 images |
| Veronica polita Fr. | 2365 images |
| Veronica serpyllifolia L. | 3573 images |
| Veronica wormskjoldii Roem. & Schult. | 5 images |
| Veronicastrum virginicum (L.) Farw. | 1117 images |
| Vesper bulbosus (A.Nelson) R.L.Hartm. & G.L.Nesom | 2 images |
| Vesper macrorhizus (Buckley) R.L.Hartm. & G.L.Nesom | 18 images |
| Viburnum acerifolium L. | 669 images |
| Viburnum nudum L. | 237 images |
| Viburnum prunifolium L. | 458 images |
| Viburnum rafinesqueanum Schult. | 3 images |
| Viburnum recognitum Fernald | 64 images |
| Viburnum rufidulum Raf. | 238 images |
| Vicia americana Muhl. ex Willd. | 82 images |
| Vicia caroliniana Walter | 51 images |
| Vicia ludoviciana Nutt. | 29 images |
| Vicia sativa L. | 14060 images |
| Vicia tetrasperma (L.) Schreb. | 581 images |
| Vicia villosa Roth | 8640 images |
| Vigna luteola (Jacq.) Benth. | 216 images |
| Viguiera dentata (Cav.) Spreng. | 109 images |
| Villadia squamulosa (S.Watson) Rose | 16 images |
| Vinca major L. | 16360 images |
| Viola adunca Sm. | 190 images |
| Viola canadensis L. | 240 images |
| Viola lanceolata L. | 58 images |
| Viola nephrophylla Greene | 1 images |
| Viola nuttallii Pursh | 36 images |
| Viola palmata L. | 19 images |
| Viola pedata L. | 171 images |
| Viola pedatifida G.Don | 17 images |
| Viola pubescens Aiton | 801 images |
| Viola sagittata Aiton | 107 images |
| Viola septemloba Leconte | 14 images |
| Viola sororia Willd. | 1701 images |
| Viola tricolor L. | 8011 images |
| Viola villosa Walter | 8 images |
| Viola walteri House | 7 images |
| Visnaga daucoides Gaertn. | 1397 images |
| Vitex agnus-castus L. | 6163 images |
| Vitex negundo L. | 301 images |
| Vitis aestivalis Michx. | 1373 images |
| Vitis arizonica Engelm. | 17 images |
| Vitis cinerea (Engelm.) Millardet | 2 images |
| Vitis mustangensis Buckley | 199 images |
| Vitis riparia Michx. | 757 images |
| Vitis rotundifolia Michx. | 1517 images |
| Vitis rupestris Scheele | 39 images |
| Vitis vulpina L. | 1018 images |
| Wahlenbergia marginata (Thunb.) A.DC. | 6 images |
| Waltheria indica L. | 423 images |
| Wedelia acapulcensis Kunth | 20 images |
| Wissadula periplocifolia (L.) Thwaites | 5 images |
| Wisteria frutescens (L.) Poir. | 887 images |
| Wisteria sinensis (Sims) DC. | 1642 images |
| Wolffia brasiliensis Wedd. | 270 images |
| Wolffia columbiana H.Karst. | 1 images |
| Wolffiella gladiata (Hegelm.) Hegelm. | 1 images |
| Woodsia obtusa (Spreng.) Torr. | 12 images |
| Woodsia oregana D.C.Eaton | 14 images |
| Woodwardia virginica (L.) Sm. | 18 images |
| Wyethia arizonica A.Gray | 2 images |
| Xanthisma gracile (Nutt.) D.R.Morgan & R.L.Hartm. | 25 images |
| Xanthisma texanum DC. | 13 images |
| Xanthium orientale L. | 455 images |
| Xanthium spinosum L. | 967 images |
| Xanthocephalum gymnospermoides (A.Gray) Benth. & Hook.f. | 3 images |
| Xanthorhiza simplicissima Marshall | 56 images |
| Xylosma flexuosa (Kunth) Hemsl. | 20 images |
| Xyris caroliniana Walter | 9 images |
| Xyris difformis Chapm. | 2 images |
| Xyris jupicai Rich. | 346 images |
| Xyris laxifolia Mart. | 11 images |
| Xyris torta Sm. | 7 images |
| Yabea microcarpa (Hook. & Arn.) Koso-Pol. | 6 images |
| Yeatesia viridiflora (Nees) Small | 3 images |
| Youngia japonica (L.) DC. | 1167 images |
| Yucca aloifolia L. | 3748 images |
| Yucca angustissima Engelm. ex Trel. | 90 images |
| Yucca arkansana Trel. | 60 images |
| Yucca baccata Torr. | 129 images |
| Yucca baileyi Wooton & Standl. | 12 images |
| Yucca campestris McKelvey | 16 images |
| Yucca constricta Buckley | 26 images |
| Yucca elata (Engelm.) Engelm. | 122 images |
| Yucca faxoniana (Trel.) Sarg. | 12 images |
| Yucca flaccida Haw. | 245 images |
| Yucca glauca Nutt. | 164 images |
| Yucca harrimaniae Trel. | 25 images |
| Yucca madrensis Gentry | 21 images |
| Yucca necopina Shinners | 27 images |
| Yucca pallida McKelvey | 79 images |
| Yucca reverchonii Trel. | 1 images |
| Yucca rostrata Engelm. ex Trel. | 498 images |
| Yucca rupicola Scheele | 70 images |
| Yucca thompsoniana Trel. | 37 images |
| Zannichellia palustris L. | 60 images |
| Zanthoxylum americanum Mill. | 219 images |
| Zanthoxylum clava-herculis L. | 153 images |
| Zanthoxylum fagara (L.) Sarg. | 180 images |
| Zea mays L. | 23913 images |
| Zeltnera texensis (Griseb.) G.Mans. ex J.S.Pringle | 1 images |
| Zephyranthes candida Herb. | 3 images |
| Zephyranthes carinata Herb. | 183 images |
| Zephyranthes chlorosolen (Herb.) D.Dietr. | 1 images |
| Zephyranthes drummondii D.Don | 4 images |
| Zephyranthes tubispatha (L'Hér.) Herb. | 11 images |
| Zeuxine strateumatica (L.) Schltr. | 49 images |
| Zinnia acerosa (DC.) A.Gray | 23 images |
| Zinnia anomala A.Gray | 14 images |
| Zinnia elegans Jacq. | 4402 images |
| Zinnia grandiflora Nutt. | 29 images |
| Zizia aurea (L.) W.D.J.Koch | 64 images |
| Ziziphus jujuba Mill. | 2549 images |
| Zornia latifolia Sm. | 13 images |
| Zoysia matrella (L.) Merr. | 38 images |
| Zuloagaea bulbosa (Kunth) Bess | 1 images |
| Zygophyllum fabago L. | 553 images |