Arnica parryi |
Arnica sororia |
|
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nodding arnica, Parry's arnica |
bunch arnica, orange arnica, twin arnica, twin leopardbane |
|
Habit | Plants 15–50(–60) cm. | Plants 15–50 cm. |
Stems | simple or branched among heads. |
(1 or relatively few) simple or branched. |
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). |
3–6 pairs, crowded toward stem bases (axils lacking tufts of brown wool); petiolate (petioles, at least basal, narrowly winged); blades (with 3 or 5, prominent, subparallel veins) oblanceolate to narrowly oblong, 3.5–14.5 × 0.6–2.4 cm, margins usually entire, rarely denticulate, apices obtuse, faces uniformly hairy, stipitate-glandular. |
Involucres | turbinate to narrowly campanulate. |
hemispheric. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
9–17; corollas yellow-orange. |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
corollas yellow; anthers yellow. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
13–20, usually narrowly, sometimes broadly, lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
1–5. |
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, 3.5–5 mm, densely hirsute, sometimes sparingly glandular as well; pappi white, bristles barbellate. |
2n | = 38, 57, 76. |
= 38. |
Arnica parryi |
Arnica sororia |
|
Phenology | Flowering May–Sep. | Flowering May–Jul. |
Habitat | Open conifer forests to alpine meadows | Prairies and grasslands to montane conifer forests |
Elevation | 500–3800 m [1600–12500 ft] | 500–1500 m [1600–4900 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
CA; ID; MT; NV; OR; UT; WA; WY; AB; BC; SK
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 370. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. fulgens var. sororia |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Greene: Ottawa Naturalist 23: 213. (1910) |
Web links |
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