Arnica parryi |
Arnica mollis |
|
---|---|---|
nodding arnica, Parry's arnica |
cordilleran arnica, cordilleran leopardbane, hairy arnica |
|
Habit | Plants 15–50(–60) cm. | Plants 15–70 cm. |
Stems | simple or branched among heads. |
(forming clumps) simple or branched among heads. |
Leaves | (2–)3–4 pairs, basal and cauline (basal usually withered by flowering, petiolate or subsessile, blades ovate or nearly round to oblong-ovate, much smaller than cauline; sterile rosettes often present, proximal cauline often crowded toward stems bases); petiolate; blades broadly to narrowly lanceolate, oblong-ovate, ovate-lanceolate, or round, 4–22 × 1–6 cm, (bases obtuse or cuneate to truncate) margins usually entire, sometimes sparsely denticulate, faces scantily to moderately pilose (hairs white), adaxial sparsely stipitate-glandular (distal cauline leaves sessile, extremely reduced, nearly linear to narrowly elliptic-lanceolate). |
(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 | turbinate to narrowly campanulate. |
hemispheric to campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
10–22; corollas yellow. |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
corollas yellow; anthers yellow. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
10–22, usually broadly lanceolate, rarely narrowly lanceolate or oblanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
1 or 3–7. |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± 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 | = 38, 57, 76. |
= 38, 57, 76, 95, 114, 133, 152. |
Arnica parryi |
Arnica mollis |
|
Phenology | Flowering May–Sep. | Flowering Jun–Sep. |
Habitat | Open conifer forests to alpine meadows | Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine |
Elevation | 500–3800 m [1600–12500 ft] | 1000–4000 m [3300–13100 ft] |
Distribution |
CA; CO; ID; MT; NV; 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. 373. | FNA vol. 21, p. 372. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Hooker: Fl. Bor.-Amer. 1: 331. (1834) |
Web links |