Arnica ovata |
Arnica sororia |
|
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diverse arnica, leaf arnica, sticky arnica, sticky-leaf arnica |
bunch arnica, orange arnica, twin arnica, twin leopardbane |
|
Habit | Plants 10–50 cm. | Plants 15–50 cm. |
Stems | (forming clumps) simple or branched among heads. |
(1 or relatively few) simple or branched. |
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. |
3–6 pairs, crowded toward stem bases (axils lacking tufts of brown wool); petiolate (petioles, at least basal, narrowly winged); blades (with 3 or 5, prominent, subparallel veins) oblanceolate to narrowly oblong, 3.5–14.5 × 0.6–2.4 cm, margins usually entire, rarely denticulate, apices obtuse, faces uniformly hairy, stipitate-glandular. |
Involucres | usually narrowly turbinate, rarely narrowly campanulate. |
hemispheric. |
Ray florets | 8–16, yellow. |
9–17; corollas yellow-orange. |
Disc florets | corollas yellow; anthers yellow. |
corollas yellow; anthers yellow. |
Phyllaries | 9–20, linear to narrowly lanceolate. |
13–20, usually narrowly, sometimes broadly, lanceolate. |
Heads | 1–3(–5). |
1–5. |
Cypselae | brown to black, 5–7 mm, sparsely to moderately pilose and stipitate-glandular; pappi stramineous to tawny, bristles subplumose. |
brown, 3.5–5 mm, densely hirsute, sometimes sparingly glandular as well; pappi white, bristles barbellate. |
2n | = 57, 76. |
= 38. |
Arnica ovata |
Arnica sororia |
|
Phenology | Flowering Jul–Sep. | Flowering May–Jul. |
Habitat | Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine | Prairies and grasslands to montane conifer forests |
Elevation | 200–3600 m (700–11800 ft) | 500–1500 m (1600–4900 ft) |
Distribution |
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; YT
|
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC; SK
|
Source | FNA vol. 21, p. 372. | FNA vol. 21, p. 370. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Synonyms | A. diversifolia, A. latifolia var. viscidula | A. fulgens var. sororia |
Name authority | Greene: Pittonia 4: 161. (1900) | Greene: Ottawa Naturalist 23: 213. (1910) |
Web links |
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