Northwestern U.S.A. Plants of Northwestern U.S.A.Explore

• Families
• Genera
• Species 494

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Acanthospermum australe (Loefl.) Kuntze

Sheepbur

91 56 Observations

Asteraceae

Acanthospermum hispidum DC.

Bristly starbur

112 77 Observations

Asteraceae

Achillea alpina L.

Chinese yarrow

18 12 Observations

Asteraceae

Achillea millefolium L.

Least Concern

Common yarrow

25,076 20,928 Observations

Asteraceae

Achillea nobilis L.

Noble yarrow

8,797 7,325 Observations

Asteraceae

Achillea ptarmica L.

Least Concern

Sneezewort

3,191 2,473 Observations

Asteraceae

Achyrachaena mollis Schauer

Blow wives

88 85 Observations

Asteraceae

Adenocaulon bicolor Hook.

Trailplant

135 107 Observations

Asteraceae

Ageratina herbacea (A.Gray) R.M.King & H.Rob.

Fragrant snakeroot

17 17 Observations

Asteraceae

Ageratina occidentalis (Hook.) R.M.King & H.Rob.

Western eupatorium

30 30 Observations

Asteraceae

Agoseris apargioides (Less.) Greene

Seaside agoseris

49 48 Observations

Asteraceae

Agoseris aurantiaca (Hook.) Greene

Mountain agoseris

46 44 Observations

Asteraceae

Agoseris glauca (Pursh) Raf.

Prairie agoseris

33 28 Observations

Asteraceae

Agoseris grandiflora (Nutt.) Greene

Grassland agoseris

53 53 Observations

Asteraceae

Agoseris heterophylla (Nutt.) Greene

Annual agoseris

45 45 Observations

Asteraceae

Agoseris retrorsa Greene

Spearleaf agoseris

28 28 Observations

Asteraceae

Ambrosia acanthicarpa Hook.

Hooker's bur ragweed

63 56 Observations

Asteraceae

Ambrosia artemisiifolia L.

Annual ragweed

4,739 3,746 Observations

Asteraceae

Ambrosia chamissonis Greene

Silver bur ragweed

133 124 Observations

Asteraceae

Ambrosia confertiflora DC.

Bur ragweed

19 19 Observations

Asteraceae

Ambrosia psilostachya DC.

Dunbible-weed

359 268 Observations

Asteraceae

Ambrosia trifida L.

Giant Ragweed

975 802 Observations

Asteraceae

Anaphalis margaritacea (L.) Benth. & Hook.f.

Pearly Everlasting

1,292 987 Observations

Asteraceae

Anisocarpus madioides Nutt.

Tarweed

14 14 Observations

Asteraceae

Antennaria alpina (L.) Gaertn.

Alpine Pussytoes

29 24 Observations

Asteraceae

Antennaria howellii Greene

Howell's pussytoes

21 20 Observations

Asteraceae

Antennaria lanata Greene

Woolly pussytoes

10 8 Observations

Asteraceae

Antennaria marginata Greene

Whitemargin pussytoes

1 1 Observation

Asteraceae

Antennaria media Greene

Rocky Mountain pussytoes

5 3 Observations

Asteraceae

Antennaria microphylla Rydb.

Littleleaf pussytoes

5 4 Observations

Asteraceae

Antennaria monocephala DC.

Pygmy pussytoes

2 2 Observations

Asteraceae

Antennaria neglecta Greene

Field pussytoes

180 121 Observations

Asteraceae

Antennaria parvifolia Nutt.

Nuttall's pussytoes

86 65 Observations

Asteraceae

Antennaria rosea Greene

Rosy pussytoes

2 2 Observations

Asteraceae

Antennaria umbrinella Rydb.

Brown-Bract Pussytoes

1 1 Observation

Asteraceae

Anthemis arvensis L.

Field chamomile

3,845 2,886 Observations

Asteraceae

Anthemis cotula L.

Chamomile

1,484 1,168 Observations

Asteraceae

Arctium lappa L.

Great Burdock

9,740 7,820 Observations

Asteraceae

Arctium minus (Hill) Bernh.

Common burdock

11,307 8,796 Observations

Asteraceae

Arctium tomentosum Mill.

Woolly burdock

1,891 1,331 Observations

Asteraceae

Arnica angustifolia Vahl

Arctic arnica

2 1 Observation

Asteraceae

Arnica cernua Howell

Serpentine arnica

3 3 Observations

Asteraceae

Arnica chamissonis Less.

Leafy arnica

82 55 Observations

Asteraceae

Arnica cordifolia Hook.

Heart-leaf arnica

196 156 Observations

Asteraceae

Arnica discoidea Benth.

Rayless arnica

2 2 Observations

Asteraceae

Arnica fulgens Pursh

Foothill arnica

5 5 Observations

Asteraceae

Arnica gracilis Rydb.

Smallhead arnica

1 1 Observation

Asteraceae

Arnica lanceolata Nutt.

Soft-leaf arnica

20 19 Observations

Asteraceae

Arnica latifolia Bong.

Arnica

31 30 Observations

Asteraceae

Arnica lonchophylla Greene

Longleaf arnica

4 1 Observation

Asteraceae

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