Arnica lanceolata |
Arnica latifolia |
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clasping arnica, streambank arnica |
broadleaf arnica, mountain arnica |
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Habit | Plants 1–5 dm; strongly rhizomatous. | |
Stems | usually simple, sometimes branched, glabrous to puberulent or villous. |
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Basal leaves | withering early, usually in separate sterile rosettes, petiolate. |
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Cauline leaves | 2–4 pairs; blades ovate, lanceolate, or elliptic, 1.5–14 cm, bases rounded to attenuate, rarely truncate or cordate; margins entire to denticulate, dentate, or serrate; veins branching laterally; tips acute; surfaces glabrous to puberulent or strigose; adaxial surfaces sometimes densely and minutely strigillose; most sessile; lower pair sometimes subsessile. |
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Peduncles | glabrate or villous, sometimes glandular-puberulent at apex. |
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Involucres | cylindric to campanulate or hemispheric, 8–15 mm. |
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Ray florets | 5–15; rays 10–28 mm, yellow. |
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Disc florets | 20–90; corollas 6–10 mm, yellow. |
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Phyllaries | broadly or narrowly lanceolate to oblanceolate, elliptic, or linear; tips acute or acuminate; surfaces glabrous to pilose or villous, sometimes tomentulose or glandular-puberulent at bases. |
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Fruits | columnar-fusiform, 5–9 mm, dark brown, glabrous to glandular-puberulent; pappus bristles 5–7 mm, white, barbellate. |
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Heads | radiate. |
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2n | =38, 76. |
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Arnica lanceolata |
Arnica latifolia |
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Distribution | ||
Discussion | Coniferous forests, meadows, shrublands, cliffs, rocky talus, clearcuts, roadsides. Flowering May–Sep. 300–2300 m. BW, Casc, CR, ECas, Owy, Sisk. CA, ID, WA; north to AK, northeast to Alberta, east to WY, southeast to NM. Native. |
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Source | Flora of Oregon, volume 2, page 185 Kenton Chambers |
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Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Arnica latifolia var. latifolia | |
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