Arnica parryi |
Arnica lessingii |
|
---|---|---|
nodding arnica, Parry's arnica |
lessing's arnica, nodding arnica, purple arnica |
|
Habit | Plants 15–50(–60) cm. | Plants 8–35 cm. |
Stems | simple or branched among heads. |
(1–3 together) usually simple, rarely branched (moderately to densely hairy, hairs translucent with purple septa). |
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–)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 | turbinate to narrowly campanulate. |
turbinate-campanulate (bases moderately villous, hairs brownish). |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
8–13; corollas yellow (laminae 14–20 mm). |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
corollas yellow; anthers dark purple. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
11–15, lanceolate to elliptic (apices obtuse, tips blunt, callous). |
Heads | (1–)3–9(–14; often nodding in bud). |
1 (nodding). |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
brown, 5–6 mm, sparsely strigose (hairs simple, apically pointed) or glabrous; pappi tawny, bristles barbellate. |
2n | = 38, 57, 76. |
= 38, 57, 76. |
Arnica parryi |
Arnica lessingii |
|
Phenology | Flowering May–Sep. | Flowering Jun–Sep. |
Habitat | Open conifer forests to alpine meadows | Coastal tundra to alpine slopes |
Elevation | 500–3800 m [1600–12500 ft] | 0–1500 m [0–4900 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
AK; BC; NT; YT; Asia (Russian Far East)
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 369. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. angustifolia var. lessingii, A. lessingii subsp. norbergii |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | (Torrey & A. Gray) Greene: Pittonia 4: 167. (1900) |
Web links |