Arnica parryi |
Arnica louiseana |
|
---|---|---|
nodding arnica, Parry's arnica |
Lake Louise arnica, snow arnica |
|
Habit | Plants 15–50(–60) cm. | Plants 5–20 cm. |
Stems | simple or branched among heads. |
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). |
1–3 pairs, mostly cauline (shorter plants often with leaves crowed mostly toward bases); petiolate; blades elliptic, oblong, or ovate-lanceolate, 1.5–7.5 × 0.5–2 cm, margins usually entire, rarely denticulate or slightly undulate, apices usually obtuse, sometimes acute or acuminate, faces glabrous or hispidulous-puberulent, ± densely stipitate-glandular. |
Involucres | turbinate to narrowly campanulate. |
campanulate-turbinate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
7–10; 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. |
10–20, narrowly lanceolate (stipitate-glandular). |
Heads | (1–)3–9(–14; often nodding in bud). |
usually 1, sometimes 2–3 (nodding at flowering). |
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 mm, abaxially glabrous, adaxially sparsely hirsute or glabrous throughout, usually stipitate-glandular toward apices, sometimes densely stipitate-glandular throughout; pappi white, bristles barbellate. |
2n | = 38, 57, 76. |
= 76, 95. |
Arnica parryi |
Arnica louiseana |
|
Phenology | Flowering May–Sep. | Flowering Jul–Aug. |
Habitat | Open conifer forests to alpine meadows | Exposed tundra slopes and calcareous rock slides |
Elevation | 500–3800 m [1600–12500 ft] | 1800–2100 m [5900–6900 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
AB; BC |
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 371. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Farr: Ottawa Naturalist 20: 109. (1906) |
Web links |