Arnica latifolia |
Arnica viscosa |
|
---|---|---|
broad-leaf arnica, daffodil leopardbane, mountain arnica |
Mount Shasta arnica, Mt. Shasta arnica, Shasta arnica |
|
Habit | Plants 10–50 cm. | Plants 20–50 cm. |
Stems | usually simple, sometimes branched distally. |
branched (prominently ribbed, strongly stipitate-glandular; caudices woody). |
Leaves | 2–4(–6) pairs, cauline (basal leaves often persistent on sterile rosettes), petiolate (proximal, petioles relatively short, broadly winged) or sessile (mid and distal); blades lance-elliptic to ovate, 2–10 × 1–6 cm, margins serrate to dentate, apices obtuse to acute, faces glabrous or sparsely villous. |
5–10 pairs (main stems, 2–6 pairs on branches; basal withered by flowering), cauline; sessile; blades obovate-oblong to ovate-oblong, (1–)2–4(–5) × 1–3 cm, margins ± entire, apices acute, faces sparsely to densely pilose, densely stipitate-glandular. |
Involucres | narrowly turbinate. |
narrowly turbinate. |
Ray florets | 8–15; corollas yellow. |
0. |
Disc florets | 20–90; corollas yellow; anthers yellow. |
10–30; corollas cream; anthers yellow. |
Phyllaries | 8–20, lanceolate to oblanceolate. |
10–20, broadly lanceolate (stipitate-glandular). |
Heads | 1 or 3–5(–9). |
10–20. |
Cypselae | dark brown, 5–9 mm, sparsely villous; pappi white, bristles barbellate. |
dark gray, 4.5–6.5 mm, stipitate-glandular; pappi usually white, rarely tawny, bristles barbellate to subplumose. |
2n | = 38, 76. |
= 38. |
Arnica latifolia |
Arnica viscosa |
|
Phenology | Flowering Jul–Aug. | Flowering Aug–Sep. |
Habitat | Relatively moist, montane conifer forests to subalpine meadows | Open, rocky subalpine to alpine |
Elevation | 500–3300 m (1600–10800 ft) | 1700–2500 m (5600–8200 ft) |
Distribution |
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; NT; YT
|
CA; OR
|
Source | FNA vol. 21, p. 376. | FNA vol. 21, p. 377. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Synonyms | Chrysopsis shastensis, Raillardella paniculata | |
Name authority | Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 147. (1832) | A. Gray: Proc. Amer. Acad. Arts 13: 374. (1878) |
Web links |