Arnica diversifolia(synonym of Arnica ovata) |
Arnica gracilis |
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sticky arnica |
slender arnica |
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Habit | Plants 1.5–4 dm; rhizomatous. | Plants 1–3 dm; rhizomatous. |
Stems | single or branched, usually glandular-puberulent, sometimes glabrate proximally or sparsely scabrous-pilose. |
usually much branched, minutely glandular-puberulent, sometimes glabrate proximally. |
Basal leaves | usually much reduced, withering early; round-ovate; petioles broadly winged. |
sometimes reduced and withering early, usually in separate sterile rosettes. |
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. |
2–3 pairs; blades triangular to ovate or lanceolate, 2–6 cm, bases truncate to rounded or attenuate; margins entire to denticulate to serrate-dentate; veins branching laterally; tips acute; surfaces glandular or spiculate, usually petiolate, sometimes sessile. |
Peduncles | glandular-puberulent. |
glabrate or minutely glandular-puberulent. |
Involucres | turbinate, 10–15 mm. |
turbinate-campanulate, 6–12 mm. |
Ray florets | 8–15; rays 10–20 mm, yellow. |
5–12; rays 10–20 mm, yellow. |
Disc florets | 15–40; corollas 7–10 mm, yellow. |
10–25; corollas 4–6 mm, yellow. |
Phyllaries | lanceolate to elliptic or linear; tips acute; surfaces pilose and stipitate-glandular. |
elliptic-lanceolate or oblanceolate; tips acute; surfaces glabrate to strigose or glandular-puberulent. |
Fruits | columnar-fusiform, 5–6.5 mm, brown or blackish, hispidulous; pappus bristles 7–10 mm; brownish, subplumose. |
columnar-fusiform, 4.5–7 mm; black; hirsute or spiculate-glandular; pappus bristles 5–7 mm, white, barbellate. |
Heads | radiate. |
radiate. |
2n | =57, 76. |
=57, 76. |
Arnica diversifolia |
Arnica gracilis |
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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. |
Open pine forests, meadows, cliffs, rocky slopes and ridges. Flowering Jun–Aug. 1400–2800 m. BW, Casc. ID, WA; north to Northwest Territories, northeast to MT, east to WY, southeast to CO. Native. |
Source | Flora of Oregon, volume 2, page 184 Kenton Chambers |
Flora of Oregon, volume 2, page 184 Kenton Chambers |
Sibling taxa | ||
Synonyms | Arnica ovata | Arnica latifolia var. gracilis |
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