Arnica diversifolia(synonym of Arnica ovata) |
Arnica rydbergii |
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sticky arnica |
Rydberg's arnica, subalpine arnica |
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Habit | Plants 1.5–4 dm; rhizomatous. | Plants 0.8–3 dm; rhizomatous. |
Stems | single or branched, usually glandular-puberulent, sometimes glabrate proximally or sparsely scabrous-pilose. |
simple, strigose or villous, usually stipitate-glandular. |
Basal leaves | usually much reduced, withering early; round-ovate; petioles broadly winged. |
usually in separate sterile rosettes; petioles winged or not. |
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. |
2–4 pairs; blades lanceolate or elliptic, 2–6 cm, bases attenuate or rounded; margins entire or denticulate distally; veins parallel from bases; tips acute; surfaces sparsely to moderately pubescent; short-petiolate or sessile. |
Peduncles | glandular-puberulent. |
stipitate-glandular, usually also villous. |
Involucres | turbinate, 10–15 mm. |
campanulate-turbinate, 7–22 mm. |
Ray florets | 8–15; rays 10–20 mm, yellow. |
6–10; rays 14–30 mm, yellow |
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. |
narrowly lanceolate to oblanceolate or elliptic; tips acute; surfaces ± pilose or tomentose at base or throughout, stipitate-glandular. |
Fruits | columnar-fusiform, 5–6.5 mm, brown or blackish, hispidulous; pappus bristles 7–10 mm; brownish, subplumose. |
columnar-fusiform, 4–7 mm, brown or blackish; hirsute; pappus bristles 5–7 mm, white, barbellate. |
Heads | radiate. |
radiate. |
. disc florets | 20–60; corollas 6–9 mm, yellow. |
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2n | =57, 76. |
=38, 76. |
Arnica diversifolia |
Arnica rydbergii |
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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. |
Alpine meadows, rocky slopes and ridges. Flowering Jul–Aug. 2200–2700 m. BW. ID, WA; north to British Columbia, northeast to Alberta, east to SD, southeast to CO. Native. |
Source | Flora of Oregon, volume 2, page 184 Kenton Chambers |
Flora of Oregon, volume 2, page 186 Kenton Chambers |
Sibling taxa | ||
Synonyms | Arnica ovata | |
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