Arnica mollis


Fl. Bor.-Amer. 1: 331. 1834

Common names: Hairy arnica
Treatment appears in FNA Volume 21. Treatment on page 372. Mentioned on page 367.
Plants 15–70 cm. Stems (forming clumps) simple or branched among heads. Leaves (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). Heads 1 or 3–7. Involucres hemispheric to campanulate. Phyllaries 10–22, usually broadly lanceolate, rarely narrowly lanceolate or oblanceolate. Ray florets 10–22; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae 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 = 38, 57, 76, 95, 114, 133, 152.

Phenology: Flowering Jun–Sep.
Habitat: Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine
Elevation: 1000–4000 m



Alta., B.C., N.W.T., Yukon, Alaska, Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.




Lower Taxa

No lower taxa listed.