Arnica cordifolia |
Arnica lessingii |
|
---|---|---|
heart-leaf arnica, heart-leaf leopardbane |
lessing's arnica, nodding arnica, purple arnica |
|
Habit | Plants 10–40(–70) cm. | Plants 8–35 cm. |
Stems | usually simple, sometimes branched. |
(1–3 together) usually simple, rarely branched (moderately to densely hairy, hairs translucent with purple septa). |
Leaves | 2–4(–6) pairs, mostly cauline (basal often persistent on sterile rosettes); petiolate; blades cordate or subcordate to ovate, 3–10 × 2–10 cm, margins dentate to coarsely dentate, apices acute to rounded, faces puberulent to sparsely villous, sometimes stipitate-glandular (especially adaxial). |
(2–)3–5(–6) pairs, usually crowded toward stem bases; petiolate or sessile (petioles short-winged); blades elliptic, lanceolate, or broadly oblanceolate, 3–10 × 1–2.5 cm, margins usually entire proximal to mid blade, subentire to denticulate distally, apices acute to obtuse, faces: abaxial paler and often glabrous, adaxial slightly hairy. |
Involucres | broadly campanulate. |
turbinate-campanulate (bases moderately villous, hairs brownish). |
Ray florets | 6–13; corollas yellow. |
8–13; corollas yellow (laminae 14–20 mm). |
Disc florets | corollas yellow; anthers yellow. |
corollas yellow; anthers dark purple. |
Phyllaries | 10–20, narrowly ovate to lanceolate. |
11–15, lanceolate to elliptic (apices obtuse, tips blunt, callous). |
Heads | 1, or 3–5(–10). |
1 (nodding). |
Cypselae | dark gray, 5–10 mm, sparsely to densely hirsute (hairs duplex), sometimes stipitate-glandular as well; pappi white, bristles barbellate. |
brown, 5–6 mm, sparsely strigose (hairs simple, apically pointed) or glabrous; pappi tawny, bristles barbellate. |
2n | = 38, 57, 76, 95, 114. |
= 38, 57, 76. |
Arnica cordifolia |
Arnica lessingii |
|
Phenology | Flowering May–Jul. | Flowering Jun–Sep. |
Habitat | Conifer forests to subalpine meadows | Coastal tundra to alpine slopes |
Elevation | 500–3000 m [1600–9800 ft] | 0–1500 m [0–4900 ft] |
Distribution |
AZ; CA; CO; ID; MI; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT
|
AK; BC; NT; YT; Asia (Russian Far East)
|
Source | FNA vol. 21, p. 374. | FNA vol. 21, p. 369. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. cordifolia var. pumila, A. paniculata, A. whitneyi | A. angustifolia var. lessingii, A. lessingii subsp. norbergii |
Name authority | Hooker: Fl. Bor.-Amer. 1: 331. (1834) | (Torrey & A. Gray) Greene: Pittonia 4: 167. (1900) |
Web links |
|