Arnica parryi |
Arnica spathulata |
|
---|---|---|
nodding arnica, Parry's arnica |
Klamath arnica, spatulate arnica |
|
Habit | Plants 15–50(–60) cm. | Plants 15–45+ cm. |
Stems | simple or branched among heads. |
simple or 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). |
3–5 pairs, sometimes crowded toward bases (basal leaves often persistent on sterile rosettes); petiolate (petioles mostly broadly winged, 1–9 × 0.2–1.5 cm); blades elliptic-ovate to spatulate, 2–8 × 1–4 cm, margins subentire to mostly irregularly dentate, apices acute, faces sparsely to densely villous, stipitate-glandular. |
Involucres | turbinate to narrowly campanulate. |
turbinate-campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
0. |
Disc florets | 20–50; corollas yellow (1 or more lobes sometimes expanded, giving appearance of laminae); anthers yellow. |
15–50; corollas yellow; anthers yellow. |
Phyllaries | 8–20, linear to narrowly lanceolate. |
8–15, broadly to narrowly lanceolate. |
Heads | (1–)3–9(–14; often nodding in bud). |
1, or 3–9(–25). |
Cypselae | brown to black, 4–7 mm, glabrous or sparsely stipitate-glandular to densely hirsute; pappi usually stramineous, rarely tawny, bristles barbellate to ± subplumose. |
black, 5–10 mm, sparsely stipitate-glandular; pappi white, bristles barbellate. |
2n | = 38, 57, 76. |
= 38, 76. |
Arnica parryi |
Arnica spathulata |
|
Phenology | Flowering May–Sep. | Flowering Apr–Jul. |
Habitat | Open conifer forests to alpine meadows | Usually serpentine soils, open, dry oak–conifer forests, disturbed areas |
Elevation | 500–3800 m [1600–12500 ft] | 200–1500 m [700–4900 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
CA; OR
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 376. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | A. eastwoodiae, A. spathulata subsp. eastwoodiae, A. spathulata var. eastwoodiae |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | Greene: Pittonia 3: 103. (1896) |
Web links |