Arnica lanceolata |
Arnica chamissonis |
|
---|---|---|
clasping arnica, streambank arnica |
Chamisso arnica, meadow arnica |
|
Habit | Plants (0.5)1–10 dm; strongly rhizomatous. | |
Stems | simple or branched distally, puberulent to villous or woolly-tomentose, sometimes glabrate proximally. |
|
Basal leaves | small, usually withering early. |
|
Cauline leaves | 4–10 pairs; well developed; blades narrowly to broadly lanceolate or elliptic, 2–18 cm; margins entire to denticulate or dentate; veins branching laterally; tips acute or obtuse; surfaces glabrous to puberulent, setose, villous, or woolly-tomentose, not glandular, proximally short-petiolate, distally sessile, sometimes winged. |
|
Peduncles | puberulent to tomentose, sometimes minutely glandular. |
|
Involucres | campanulate, 8–13 mm. |
|
Ray florets | 8–13; rays 5–20 mm, yellow. |
|
Disc florets | 30–50+; corollas 7–11 mm, yellow. |
|
Phyllaries | lance-linear to lance-elliptic or oblanceolate; tips acute, with conspicuous tuft of white trichomes; surfaces puberulent to tomentose, sometimes minutely glandular. |
|
Fruits | columnar, 4–6 mm; blackish, glabrous to minutely puberulent; pappus bristles 4–6 mm, white or straw-colored, barbellate to subplumose. |
|
Heads | radiate. |
|
2n | =38, 57, 76. |
|
Arnica lanceolata |
Arnica chamissonis |
|
Distribution | ||
Discussion | Moist meadows, wet forests, streambanks. Flowering May–Sep. 800–2300 m. BR, BW, Casc, ECas, Lava, Owy. CA, NV, ID, WA; throughout Canada and western US. Native. |
|
Source | Flora of Oregon, volume 2, page 183 Kenton Chambers |
|
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Arnica chamissonis ssp. foliosa, Arnica chamissonis ssp. incana, Arnica chamissonis var. foliosa, Arnica chamissonis var. incana | |
Web links |
|
|