Arnica lanceolata |
Arnica dealbata |
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clasping arnica, lance-leaf arnica, stream bank arnica |
mock leopardbane |
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Habit | Plants (5–)20–80 cm. | Plants 15–35 cm. | ||||
Stems | solitary to densely clumped, simple or branched among heads. |
mostly simple. |
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Leaves | 4–8(–10) pairs, mostly cauline; usually sessile (sometimes with partly connate-sheathing bases), sometimes petiolate (proximalmost); blades lance-elliptic, lanceolate, oblanceolate, obovate, or ovate, 4–12(–20) × (1–)2–6(–8) cm, margins subentire to dentate-serrate, apices usually acute, rarely obtuse, faces glabrate to pilose. |
3–8 pairs, mostly crowded toward bases; petiolate (at least proximal); blades elliptic to oblanceolate or obovate, 5–10 × 0.5–3.5 cm, margins entire, apices acute, faces densely hairy (hairs relatively short, curly) and sessile-glandular (distal leaves sessile, much reduced). |
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Involucres | narrowly campanulate to turbinate. |
campanulate to hemispheric. |
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Ray florets | (5–)7–17(–20); corollas yellow. |
5–12; corollas yellow. |
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Disc florets | corollas yellow; anthers yellow. |
(functionally staminate): corollas yellow; anthers yellow (styles rarely exserted). |
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Phyllaries | 8–15(–19), narrowly to broadly lanceolate. |
5–12 (in 1 series), oblong or elliptic. |
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Heads | (1–)3–10(–20). |
1–6. |
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Cypselae | brown, 4–8 mm, sparsely hirsutulous, stipitate-glandular; pappi tawny, bristles subplumose. |
brown to black, 4–10 mm, sparsely to densely hirsute (hairs usually simple, rarely duplex) and sparsely stipitate-glandular; pappi 0. |
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2n | = 38, 76. |
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Arnica lanceolata |
Arnica dealbata |
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Phenology | Flowering Jun–Aug. | |||||
Habitat | Open forests, meadows, slopes | |||||
Elevation | 1200–2400 m (3900–7900 ft) | |||||
Distribution |
AK; CA; ID; ME; MT; NH; NV; OR; UT; WA; WY; AB; BC; NB; NT; QC; YT
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CA
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Although Arnica dealbata lacks pappi, morphologic, cytologic, and molecular data (B. G. Baldwin and B. L. Wessa 2000; Baldwin et al. 2002) clearly support its inclusion in Arnica. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 375. | ||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Whitneya dealbata | |||||
Name authority | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 407. (1841) | (A. Gray) B. G. Baldwin: Novon 9: 460. (1999) | ||||
Web links |
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