Arnica dealbata |
Arnica louiseana |
|
---|---|---|
mock leopardbane |
Lake Louise arnica, snow arnica |
|
Habit | Plants 15–35 cm. | Plants 5–20 cm. |
Stems | mostly simple. |
simple. |
Leaves | 3–8 pairs, mostly crowded toward bases; petiolate (at least proximal); blades elliptic to oblanceolate or obovate, 5–10 × 0.5–3.5 cm, margins entire, apices acute, faces densely hairy (hairs relatively short, curly) and sessile-glandular (distal leaves sessile, much reduced). |
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 | campanulate to hemispheric. |
campanulate-turbinate. |
Ray florets | 5–12; corollas yellow. |
7–10; corollas yellow. |
Disc florets | (functionally staminate): corollas yellow; anthers yellow (styles rarely exserted). |
corollas yellow; anthers yellow. |
Phyllaries | 5–12 (in 1 series), oblong or elliptic. |
10–20, narrowly lanceolate (stipitate-glandular). |
Heads | 1–6. |
usually 1, sometimes 2–3 (nodding at flowering). |
Cypselae | brown to black, 4–10 mm, sparsely to densely hirsute (hairs usually simple, rarely duplex) and sparsely stipitate-glandular; pappi 0. |
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, 76. |
= 76, 95. |
Arnica dealbata |
Arnica louiseana |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Aug. |
Habitat | Open forests, meadows, slopes | Exposed tundra slopes and calcareous rock slides |
Elevation | 1200–2400 m (3900–7900 ft) | 1800–2100 m (5900–6900 ft) |
Distribution |
CA
|
AB; BC |
Discussion | Although Arnica dealbata lacks pappi, morphologic, cytologic, and molecular data (B. G. Baldwin and B. L. Wessa 2000; Baldwin et al. 2002) clearly support its inclusion in Arnica. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 21, p. 375. | FNA vol. 21, p. 371. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Synonyms | Whitneya dealbata | |
Name authority | (A. Gray) B. G. Baldwin: Novon 9: 460. (1999) | Farr: Ottawa Naturalist 20: 109. (1906) |
Web links |