Arnica parryi |
Arnica cernua |
|
---|---|---|
nodding arnica, Parry's arnica |
nodding arnica, serpentine arnica |
|
Habit | Plants 15–50(–60) cm. | Plants 10–30 cm. |
Stems | simple or branched among heads. |
(often reddish purple) mostly simple. |
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). |
3–4 pairs, mostly cauline (basal often persistent on sterile rosettes); petiolate (petioles usually narrow, proximalmost sometimes broadly winged); blades (often reddish purple) usually elliptic to ovate, sometimes subcordate, 1.5–8 × 1.5–4 cm (often relatively thick, nearly succulent), margins usually entire or serrate, sometimes crenate or slightly lobed, apices acute to rounded, faces glabrous or scabrous. |
Involucres | turbinate to narrowly campanulate. |
campanulate-turbinate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
5–10; corollas yellow to slightly orange. |
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. |
8–14, ovate to broadly lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
usually 1, sometimes 2–3 (often nodding in bud). |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
dark gray, 6–8 mm, sparsely to densely hirsute (hairs duplex); pappi white, bristles usually barbellate, sometimes subplumose. |
2n | = 38, 57, 76. |
= 38. |
Arnica parryi |
Arnica cernua |
|
Phenology | Flowering May–Sep. | Flowering Apr–Jun. |
Habitat | Open conifer forests to alpine meadows | Serpentine soils, conifer forests |
Elevation | 500–3800 m [1600–12500 ft] | 500–1500 m [1600–4900 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
CA; OR
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 374. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. chandleri |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Howell: Fl. N.W. Amer., 373. (1900) |
Web links |