Arnica ovata |
Arnica parryi |
|
---|---|---|
diverse arnica, leaf arnica, sticky arnica, sticky-leaf arnica |
nodding arnica, Parry's arnica |
|
Habit | Plants 10–50 cm. | Plants 15–50(–60) cm. |
Stems | (forming clumps) simple or branched among heads. |
simple or branched among heads. |
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. |
(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). |
Involucres | usually narrowly turbinate, rarely narrowly campanulate. |
turbinate to narrowly campanulate. |
Ray florets | 8–16, yellow. |
usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
Disc florets | corollas yellow; anthers yellow. |
20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
Phyllaries | 9–20, linear to narrowly lanceolate. |
8–20, linear to narrowly lanceolate. |
Heads | 1–3(–5). |
(1–)3–9(–14; often nodding in bud). |
Cypselae | brown to black, 5–7 mm, sparsely to moderately pilose and stipitate-glandular; pappi stramineous to tawny, bristles subplumose. |
brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
2n | = 57, 76. |
= 38, 57, 76. |
Arnica ovata |
Arnica parryi |
|
Phenology | Flowering Jul–Sep. | Flowering May–Sep. |
Habitat | Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine | Open conifer forests to alpine meadows |
Elevation | 200–3600 m (700–11800 ft) | 500–3800 m (1600–12500 ft) |
Distribution |
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; YT
|
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
Source | FNA vol. 21, p. 372. | FNA vol. 21, p. 373. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Synonyms | A. diversifolia, A. latifolia var. viscidula | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei |
Name authority | Greene: Pittonia 4: 161. (1900) | A. Gray: Amer. Naturalist 8: 213. (1874) |
Web links |
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