Arnica parryi |
Arnica angustifolia |
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nodding arnica, Parry's arnica |
alpine arnica, arctic arnica, narrow-leaf arnica |
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Habit | Plants 15–50(–60) cm. | Plants 5–40 cm. | ||||
Stems | simple or branched among heads. |
usually simple, rarely branched. |
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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). |
1–5 pairs, mostly cauline; petiolate (petioles broadly to narrowly winged, shorter than blades); blades broadly lanceolate to linear, 2–20 × 0.3–4 cm, margins entire or irregularly denticulate or dentate, apices acute or acuminate, faces glabrous or densely woolly-villous and stipitate-glandular. |
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Involucres | turbinate to narrowly campanulate. |
hemispheric. |
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Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
6–16; 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. |
9–22, usually narrowly to broadly lanceolate, sometimes oblanceolate. |
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Heads | (1–)3–9(–14; often nodding in bud). |
1–3(–5; erect). |
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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, 3–8 mm, densely hirsute, rarely glandular; pappi white, bristles barbellate. |
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2n | = 38, 57, 76. |
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Arnica parryi |
Arnica angustifolia |
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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; MT; AB; BC; MB; NF; NT; NU; ON; QC; SK; YT; Europe; Asia
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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. 369. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. alpina subsp. angustifolia, A. alpina var. angustifolia | ||||
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Vahl: in G. C. Oeder et al., Fl. Dan. 9(26): 5, plate 1524. (1816) | ||||
Web links |