Flora of North America species comparison

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Arnica mollis

cordilleran arnica, cordilleran leopardbane, hairy arnica
Habit 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).
Involucres

hemispheric to campanulate.
Ray florets

10–22;

corollas yellow.
Disc florets

corollas yellow;

anthers yellow.
Phyllaries

10–22, usually broadly lanceolate, rarely narrowly lanceolate or oblanceolate.
Heads

1 or 3–7.
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.

Arnica mollis
Phenology Flowering Jun–Sep.
Habitat Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine
Elevation 1000–4000 m (3300–13100 ft)
Distribution
from FNA
AK; CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; NT; YT
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 372.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica
Sibling taxa
A. acaulis, A. angustifolia, A. cernua, A. chamissonis, A. cordifolia, A. dealbata, A. discoidea, A. fulgens, A. gracilis, A. griscomii, A. lanceolata, A. latifolia, A. lessingii, A. lonchophylla, A. longifolia, A. louiseana, A. nevadensis, A. ovata, A. parryi, A. rydbergii, A. sororia, A. spathulata, A. unalaschcensis, A. venosa, A. viscosa
Name authority Hooker: Fl. Bor.-Amer. 1: 331. (1834)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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