Arnica ovata |
Arnica venosa |
|
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diverse arnica, leaf arnica, sticky arnica, sticky-leaf arnica |
Shasta County arnica, veiny arnica |
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Habit | Plants 10–50 cm. | Plants 20–60 cm. |
Stems | (forming clumps) simple or branched among heads. |
simple or branched (prominently ribbed; caudices woody). |
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. |
6–10 pairs, cauline (basal leaves withered by flowering; proximal cauline scalelike, middle leaves largest, distal reduced, bractlike) usually broadly sessile, rarely broadly petiolate; blades (3- or 5-nerved, strongly reticulate-veined) ovate-elliptic to broadly lanceolate, 3–7 × 1.5–4 cm (firm), margins irregularly and coarsely serrate, apices acute to obtuse, faces: abaxial pilose, stipitate-glandular (especially on veins), adaxial glabrate to stipitate-glandular. |
Involucres | usually narrowly turbinate, rarely narrowly campanulate. |
turbinate-campanulate. |
Ray florets | 8–16, yellow. |
0. |
Disc florets | corollas yellow; anthers yellow. |
30–60; corollas yellow; anthers yellow. |
Phyllaries | 9–20, linear to narrowly lanceolate. |
8–19, ovate to broadly lanceolate. |
Heads | 1–3(–5). |
1. |
Cypselae | brown to black, 5–7 mm, sparsely to moderately pilose and stipitate-glandular; pappi stramineous to tawny, bristles subplumose. |
dark gray, 6–8 mm, densely hirsute (hairs duplex); pappi white, bristles barbellate. |
2n | = 57, 76. |
= 38. |
Arnica ovata |
Arnica venosa |
|
Phenology | Flowering Jul–Sep. | Flowering May–Jun. |
Habitat | Moist meadows and conifer forests, stream banks, late snow-melt areas, montane to subalpine | Open, often disturbed, oak-pine forests |
Elevation | 200–3600 m (700–11800 ft) | 400–1400 m (1300–4600 ft) |
Distribution |
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; YT
|
CA |
Discussion | Arnica venosa is known only from Shasta and Trinity counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 21, p. 372. | FNA vol. 21, p. 376. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Synonyms | A. diversifolia, A. latifolia var. viscidula | |
Name authority | Greene: Pittonia 4: 161. (1900) | H. M. Hall: Univ. Calif. Publ. Bot. 6: 174. (1915) |
Web links |
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