Arnica latifolia |
Arnica louiseana |
|
---|---|---|
broad-leaf arnica, daffodil leopardbane, mountain arnica |
Lake Louise arnica, snow arnica |
|
Habit | Plants 10–50 cm. | Plants 5–20 cm. |
Stems | usually simple, sometimes branched distally. |
simple. |
Leaves | 2–4(–6) pairs, cauline (basal leaves often persistent on sterile rosettes), petiolate (proximal, petioles relatively short, broadly winged) or sessile (mid and distal); blades lance-elliptic to ovate, 2–10 × 1–6 cm, margins serrate to dentate, apices obtuse to acute, faces glabrous or sparsely villous. |
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 | narrowly turbinate. |
campanulate-turbinate. |
Ray florets | 8–15; corollas yellow. |
7–10; corollas yellow. |
Disc florets | 20–90; corollas yellow; anthers yellow. |
corollas yellow; anthers yellow. |
Phyllaries | 8–20, lanceolate to oblanceolate. |
10–20, narrowly lanceolate (stipitate-glandular). |
Heads | 1 or 3–5(–9). |
usually 1, sometimes 2–3 (nodding at flowering). |
Cypselae | dark brown, 5–9 mm, sparsely villous; pappi white, bristles barbellate. |
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 latifolia |
Arnica louiseana |
|
Phenology | Flowering Jul–Aug. | Flowering Jul–Aug. |
Habitat | Relatively moist, montane conifer forests to subalpine meadows | Exposed tundra slopes and calcareous rock slides |
Elevation | 500–3300 m (1600–10800 ft) | 1800–2100 m (5900–6900 ft) |
Distribution |
AK; CA; CO; ID; MT; OR; UT; WA; WY; AB; BC; NT; YT
|
AB; BC |
Source | FNA vol. 21, p. 376. | FNA vol. 21, p. 371. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Arnica |
Sibling taxa | ||
Name authority | Bongard: Mém. Acad. Imp. Sci. St.-Pétersbourg, Sér. 6, Sci. Math. 2: 147. (1832) | Farr: Ottawa Naturalist 20: 109. (1906) |
Web links |