Arnica parryi |
Arnica longifolia |
|
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nodding arnica, Parry's arnica |
long-leaf arnica, seep-spring arnica, spear-leaf arnica, spear-leaf leopardbane |
|
Habit | Plants 15–50(–60) cm. | Plants 30–60(–110) cm. |
Stems | simple or branched among heads. |
(often relatively numerous, clustered in clonal patches) simple. |
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). |
5–7 pairs, mostly cauline (basal leaves usually withered by flowering); sessile or subsessile (proximalmost with connate-sheathing bases); blades lanceolate to lance-elliptic, 5–12(–15) × 1.5–3.5 cm, margins usually entire, rarely denticulate, apices acute to acuminate, faces scabrid-puberulent, sometimes glandular (distal leaves not much reduced). |
Involucres | turbinate to narrowly campanulate. |
turbinate-campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
6–15; corollas yellow. |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
6–11; corollas yellow; anthers yellow. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
11–15(–20), narrow to broadly lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
3–20(–35). |
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 to black, 3–7 mm, glabrous or sparsely hirsutulous, stipitate-glandular; pappi stramineous to tawny, bristles barbellate to subplumose. |
2n | = 38, 57, 76. |
= 57, 76. |
Arnica parryi |
Arnica longifolia |
|
Phenology | Flowering May–Sep. | Flowering Jun–Oct. |
Habitat | Open conifer forests to alpine meadows | Montane coniferous forests to alpine, usually moist areas, stream banks or late snow-melt areas |
Elevation | 500–3800 m [1600–12500 ft] | 1300–3700 m [4300–12100 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 374. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. longifolia subsp. myriadenia, A. myriadenia |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | D. C. Eaton: in S. Watson, Botany (Fortieth Parallel), 186. (1871) |
Web links |
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