Arnica parryi |
Arnica cordifolia |
|
---|---|---|
nodding arnica, Parry's arnica |
heart-leaf arnica, heart-leaf leopardbane |
|
Habit | Plants 15–50(–60) cm. | Plants 10–40(–70) cm. |
Stems | simple or branched among heads. |
usually simple, sometimes branched. |
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). |
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). |
Involucres | turbinate to narrowly campanulate. |
broadly campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
6–13; 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 ovate to lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
1, or 3–5(–10). |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
dark gray, 5–10 mm, sparsely to densely hirsute (hairs duplex), sometimes stipitate-glandular as well; pappi white, bristles barbellate. |
2n | = 38, 57, 76. |
= 38, 57, 76, 95, 114. |
Arnica parryi |
Arnica cordifolia |
|
Phenology | Flowering May–Sep. | Flowering May–Jul. |
Habitat | Open conifer forests to alpine meadows | Conifer forests to subalpine meadows |
Elevation | 500–3800 m [1600–12500 ft] | 500–3000 m [1600–9800 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
AZ; CA; CO; ID; MI; MT; NM; NV; OR; SD; UT; WA; WY; AB; BC; MB; NT; ON; SK; YT
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 374. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. cordifolia var. pumila, A. paniculata, A. whitneyi |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Hooker: Fl. Bor.-Amer. 1: 331. (1834) |
Web links |
|