Arnica parryi |
Arnica chamissonis |
|
---|---|---|
nodding arnica, Parry's arnica |
arnica de Chamisso, Chamisso arnica, leafy arnica, leafy leapordbane, meadow arnica, narrow-leaf arnica, silvery arnica |
|
Habit | Plants 15–50(–60) cm. | Plants 20–80(–150) cm. |
Stems | simple or branched among heads. |
usually branched from mid heights or distally. |
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). |
4–10 pairs, mostly cauline (evenly distributed; basal leaves often withered by flowering, 1–2 pairs, subsessile to short-petiolate); sessile (proximalmost with membranous connate-sheathing bases); blades lance-elliptic, broadly oblanceolate, or oblong, 5–20 × 2–6(–8) cm, margins entire or remotely denticulate to prominently dentate, apices acute, faces nearly glabrous or puberulent to sparsely or densely white-tomentose-pilose. |
Involucres | turbinate to narrowly campanulate. |
campanulate (rarely hemispheric). |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
8–20; corollas yellow. |
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. |
8–23, nearly linear to narrowly lanceolate (apices each with conspicuous tuft of white hairs). |
Heads | (1–)3–9(–14; often nodding in bud). |
(1–)3–10(–16). |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
gray to brown, 3–8 mm, subglabrous to sparsely hirsutulous, stipitate-glandular; pappi stramineous, bristles barbellate to subplumose. |
2n | = 38, 57, 76. |
= 38, 57, 76. |
Arnica parryi |
Arnica chamissonis |
|
Phenology | Flowering May–Sep. | Flowering Apr–Sep. |
Habitat | Open conifer forests to alpine meadows | Moist meadows and conifer forests, stream banks, late snow-melt areas, often montane to subalpine |
Elevation | 500–3800 m [1600–12500 ft] | 0–3500 m [0–11500 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
AK; AZ; CA; CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC; MB; NT; ON; QC; SK; YT
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 372. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. bernardina, A. chamissonis var. bernardina, A. chamissonis subsp. foliosa, A. chamissonis var. foliosa, A. chamissonis subsp. incana, A. chamissonis var. incana, A. chamissonis var. interior, A. chamissonis var. jepsoniana, A. foliosa |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Lessing: Linnaea 6: 238. (1831) |
Web links |