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Arnica mollis
Arnica mollis
Hook.
(redirected from:
Arnica rivularis
Greene)
Family:
Asteraceae
[
Arnica mollis var. silvatica
(Greene) Maguire,
more
Arnica rivularis
Greene
]
Flora of North America
Resources
Steven J. Wolf in Flora of North America (vol. 21)
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).
2
n
= 38, 57, 76, 95, 114, 133, 152. Flowering Jun-Sep. Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine; 1000-4000 m; Alta., B.C., N.W.T., Yukon; Alaska, Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.
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