Arnica parryi |
Arnica lanceolata |
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nodding arnica, Parry's arnica |
clasping arnica, lance-leaf arnica, stream bank arnica |
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Habit | Plants 15–50(–60) cm. | Plants (5–)20–80 cm. | ||||
Stems | simple or branched among heads. |
solitary to densely clumped, simple or branched among heads. |
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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). |
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. |
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Involucres | turbinate to narrowly campanulate. |
narrowly campanulate to turbinate. |
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Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
(5–)7–17(–20); corollas yellow. |
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Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
corollas yellow; anthers yellow. |
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Phyllaries | 8–20, linear to narrowly lanceolate. |
8–15(–19), narrowly to broadly lanceolate. |
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Heads | (1–)3–9(–14; often nodding in bud). |
(1–)3–10(–20). |
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Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
brown, 4–8 mm, sparsely hirsutulous, stipitate-glandular; pappi tawny, bristles subplumose. |
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2n | = 38, 57, 76. |
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Arnica parryi |
Arnica lanceolata |
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Phenology | Flowering May–Sep. | |||||
Habitat | Open conifer forests to alpine meadows | |||||
Elevation | 500–3800 m [1600–12500 ft] | |||||
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
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AK; CA; ID; ME; MT; NH; NV; OR; UT; WA; WY; AB; BC; NB; NT; QC; YT
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Discussion | Subspecies 2 (2 in the flora). (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. 373. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | |||||
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Nuttall: Trans. Amer. Philos. Soc., n. s. 7: 407. (1841) | ||||
Web links |
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