Arnica diversifolia(synonym of Arnica ovata) |
Arnica unalaschcensis |
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sticky arnica |
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Habit | Plants 1.5–4 dm; rhizomatous. | |
Stems | single or branched, usually glandular-puberulent, sometimes glabrate proximally or sparsely scabrous-pilose. |
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Basal leaves | usually much reduced, withering early; round-ovate; petioles broadly winged. |
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Cauline leaves | 2–3(4) pairs; distal 1–2 pairs reduced and bract-like; blades ovate to lanceolate, 2–8 cm, bases truncate or attenuate; margins denticulate or serrate-dentate, rarely entire; veins branching laterally; tips acute or obtuse; surfaces glabrous to glandular-puberulent, often gland-dotted; short-petiolate or sessile. |
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Peduncles | glandular-puberulent. |
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Involucres | turbinate, 10–15 mm. |
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Ray florets | 8–15; rays 10–20 mm, yellow. |
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Disc florets | 15–40; corollas 7–10 mm, yellow. |
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Phyllaries | lanceolate to elliptic or linear; tips acute; surfaces pilose and stipitate-glandular. |
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Fruits | columnar-fusiform, 5–6.5 mm, brown or blackish, hispidulous; pappus bristles 7–10 mm; brownish, subplumose. |
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Heads | radiate. |
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2n | =57, 76. |
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Arnica diversifolia |
Arnica unalaschcensis |
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Distribution | ||
Discussion | Open pine forests, grasslands, bogs, subalpine talus, cliffs, ridges. Flowering Jul–Sep. 1700–3000 m. BW, Casc. CA, ID, WA; north to AK, northeast to MT, southeast to UT. Native. |
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Source | Flora of Oregon, volume 2, page 184 Kenton Chambers |
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Sibling taxa | ||
Synonyms | Arnica ovata | |
Web links |
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