Arnica ovata |
Arnica mollis |
|
---|---|---|
diverse arnica, leaf arnica, sticky arnica, sticky-leaf arnica |
cordilleran arnica, cordilleran leopardbane, hairy arnica |
|
Habit | Plants 10–50 cm. | Plants 15–70 cm. |
Stems | (forming clumps) simple or branched among heads. |
(forming clumps) simple or branched among heads. |
Leaves | 2–3(–4) pairs (basal 1–2 pairs usually withered by flowering, petiolate, petioles broadly winged, blades round-ovate, relatively small; sterile rosettes lacking), mostly cauline; petiolate (at least middle pair, petioles broadly to narrowly winged); blades broadly deltate to ovate, 4–8 × 2–6 cm (middle pair largest), margins irregularly denticulate to coarsely dentate-serrate, apices acute, faces puberulent (hairs minute) and stipitate-glandular. |
(2–)3(–4) pairs, mostly cauline (basal sometimes present); petiolate (petioles relatively short, broad-winged) or subsessile; blades broadly elliptic, lance-elliptic, or narrowly to broadly lanceolate, 4–20 × 1–4 cm, margins entire or irregularly denticulate, apices acute, faces sparsely to moderately hairy (hairs relatively short to long, stipitate glands or soft, silky). |
Involucres | usually narrowly turbinate, rarely narrowly campanulate. |
hemispheric to campanulate. |
Ray florets | 8–16, yellow. |
10–22; corollas yellow. |
Disc florets | corollas yellow; anthers yellow. |
corollas yellow; anthers yellow. |
Phyllaries | 9–20, linear to narrowly lanceolate. |
10–22, usually broadly lanceolate, rarely narrowly lanceolate or oblanceolate. |
Heads | 1–3(–5). |
1 or 3–7. |
Cypselae | brown to black, 5–7 mm, sparsely to moderately pilose and stipitate-glandular; pappi stramineous to tawny, bristles subplumose. |
grayish brown to black, 4–8 mm, mostly stipitate-glandular, sparsely hirsutulous (hairs white to brownish, simple or bifid); pappi tawny, bristles plumose (with deep, amberlike deposits). |
2n | = 57, 76. |
= 38, 57, 76, 95, 114, 133, 152. |
Arnica ovata |
Arnica mollis |
|
Phenology | Flowering Jul–Sep. | Flowering Jun–Sep. |
Habitat | Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine | Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine |
Elevation | 200–3600 m (700–11800 ft) | 1000–4000 m (3300–13100 ft) |
Distribution |
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; YT
|
AK; CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; NT; YT
|
Source | FNA vol. 21, p. 372. | FNA vol. 21, p. 372. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Synonyms | A. diversifolia, A. latifolia var. viscidula | |
Name authority | Greene: Pittonia 4: 161. (1900) | Hooker: Fl. Bor.-Amer. 1: 331. (1834) |
Web links |
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