Arnica cordifolia |
Arnica viscosa |
|
---|---|---|
heart-leaf arnica, heart-leaf leopardbane |
Mount Shasta arnica, Mt. Shasta arnica, Shasta arnica |
|
Habit | Plants 10–40(–70) cm. | Plants 20–50 cm. |
Stems | usually simple, sometimes branched. |
branched (prominently ribbed, strongly stipitate-glandular; caudices woody). |
Leaves | 2–4(–6) pairs, mostly cauline (basal often persistent on sterile rosettes); petiolate; blades cordate or subcordate to ovate, 3–10 × 2–10 cm, margins dentate to coarsely dentate, apices acute to rounded, faces puberulent to sparsely villous, sometimes stipitate-glandular (especially adaxial). |
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 | broadly campanulate. |
narrowly turbinate. |
Ray florets | 6–13; corollas yellow. |
0. |
Disc florets | corollas yellow; anthers yellow. |
10–30; corollas cream; anthers yellow. |
Phyllaries | 10–20, narrowly ovate to lanceolate. |
10–20, broadly lanceolate (stipitate-glandular). |
Heads | 1, or 3–5(–10). |
10–20. |
Cypselae | dark gray, 5–10 mm, sparsely to densely hirsute (hairs duplex), sometimes stipitate-glandular as well; pappi white, bristles barbellate. |
dark gray, 4.5–6.5 mm, stipitate-glandular; pappi usually white, rarely tawny, bristles barbellate to subplumose. |
2n | = 38, 57, 76, 95, 114. |
= 38. |
Arnica cordifolia |
Arnica viscosa |
|
Phenology | Flowering May–Jul. | Flowering Aug–Sep. |
Habitat | Conifer forests to subalpine meadows | Open, rocky subalpine to alpine |
Elevation | 500–3000 m [1600–9800 ft] | 1700–2500 m [5600–8200 ft] |
Distribution |
AZ; CA; CO; ID; MI; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT
|
CA; OR
|
Source | FNA vol. 21, p. 374. | FNA vol. 21, p. 377. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. cordifolia var. pumila, A. paniculata, A. whitneyi | Chrysopsis shastensis, Raillardella paniculata |
Name authority | Hooker: Fl. Bor.-Amer. 1: 331. (1834) | A. Gray: Proc. Amer. Acad. Arts 13: 374. (1878) |
Web links |
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