Arnica parryi |
Arnica discoidea |
|
---|---|---|
nodding arnica, Parry's arnica |
rayless arnica, rayless leopardbane |
|
Habit | Plants 15–50(–60) cm. | Plants 15–60 cm. |
Stems | simple or branched among heads. |
mostly simple or distally 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). |
3–7 pairs, sometimes crowded at stem bases (basal leaves often persistent on sterile rosettes); petiolate (petioles narrow, 1.5–8 cm, often broadly winged on distal reduced leaves); blades usually ovate to broadly lanceolate, seldom subcordate, 2–12 × 1–7 cm, margins usually serrate to coarsely dentate or crenate, rarely subentire, faces glabrate to pilose, stipitate-glandular. |
Involucres | turbinate to narrowly campanulate. |
turbinate-campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
usually 0 (corollas of peripheral florets rarely dilated, resembling rays). |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
20–50; corollas yellow; anthers yellow. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
8–15, ovate-lanceolate to narrowly lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
3–10(–30; erect). |
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, 6–8 mm, hirsute (hairs duplex) and stipitate-glandular; pappi white, bristles usually barbellate, sometimes subplumose. |
2n | = 38, 57, 76. |
= 38, 57, 76. |
Arnica parryi |
Arnica discoidea |
|
Phenology | Flowering May–Sep. | Flowering May–Jul. |
Habitat | Open conifer forests to alpine meadows | Chaparral, oak and pine forests |
Elevation | 500–3800 m [1600–12500 ft] | 100–1500 m [300–4900 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
CA; NV; OR; WA
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 375. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. alata, A. cordifolia var. eradiata, A. discoidea var. alata, A. discoidea var. eradiata, A. parviflora |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Bentham: Pl. Hartw., 319. (1849) |
Web links |
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