Arnica latifolia |
Arnica parryi |
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broadleaf arnica, mountain arnica |
Parry's arnica |
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Habit | Plants 1–5 dm; strongly rhizomatous. | Plants 1.5–7 dm; rhizomatous. |
Stems | usually simple, sometimes branched, glabrous to puberulent or villous. |
simple to much branched, villous, stipitate-glandular distally. |
Basal leaves | withering early, usually in separate sterile rosettes, petiolate. |
withered by flowering, often in separate sterile rosettes, petiolate or subsessile. |
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. |
2–4 pairs; lowermost crowded near stem bases; upper pairs much reduced; blades ovate to lanceolate or linear-elliptic, 2–10 cm, bases rounded or attenuate; margins entire or denticulate; veins branching laterally; tips acute; surfaces villous-tomentose, sparsely stipitate-glandular or gland-dotted adaxially; lowermost long-petiolate; upper sessile. |
Peduncles | glabrate or villous, sometimes glandular-puberulent at apex. |
stipitate-glandular. |
Involucres | cylindric to campanulate or hemispheric, 8–15 mm. |
campanulate, 10–15 mm. |
Ray florets | 5–15; rays 10–28 mm, yellow. |
0 or obscure. |
Disc florets | 20–90; corollas 6–10 mm, yellow. |
20–60; corollas 8–10 mm, yellow. |
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. |
narrowly oblanceolate to elliptic or linear; tips acute or acuminate; surfaces stipitate-glandular, sometimes also hispid. |
Fruits | columnar-fusiform, 5–9 mm, dark brown, glabrous to glandular-puberulent; pappus bristles 5–7 mm, white, barbellate. |
columnar-fusiform, 4–6 mm, dark brown or blackish, glabrous or hispid; pappus bristles 7–10 mm; straw-colored, barbellate. |
Heads | radiate. |
discoid or rarely obscurely radiate, nodding in bud. |
2n | =38, 76. |
=38, 57, 76. |
Arnica latifolia |
Arnica parryi |
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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. |
Coniferous forests, meadows, ridges. Flowering Jun–Sep. 1200–2700 m. BR, BW, Casc, ECas, Sisk. CA, ID, NV, WA; north to Yukon, northeast to Alberta, east to WY, southeast to CO. Native. |
Source | Flora of Oregon, volume 2, page 185 Kenton Chambers |
Flora of Oregon, volume 2, page 186 Kenton Chambers |
Sibling taxa | ||
Synonyms | Arnica latifolia var. latifolia | Arnica parryi var. parryi, Arnica parryi var. sonnei |
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