Arnica parryi |
Arnica acaulis |
|
---|---|---|
nodding arnica, Parry's arnica |
common leopardbane |
|
Habit | Plants 15–50(–60) cm. | Plants 20–80 cm. |
Stems | simple or branched among heads. |
simple. |
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, nearly all basal; sessile; blades (with 3, 5, or 7 prominent, subparallel veins) broadly elliptic, ovate, or rhombic, 4–15 × 1.5–8 cm, margins mostly entire, apices mostly obtuse, faces hirsute and stipitate-glandular (cauline leaves 0 or 1–2, distalmost often alternate, much reduced). |
Involucres | turbinate to narrowly campanulate. |
campanulate. |
Ray florets | usually 0 (sometimes peripheral florets pistillate; corollas yellow, laminae rudimentary). |
10–16; 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. |
12–18, narrowly ovate. |
Heads | (1–)3–9(–14; often nodding in bud). |
3–20. |
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 to dark brown, 5–7 mm, glabrous or sparsely stipitate-glandular; pappi white, bristles barbellate. |
2n | = 38, 57, 76. |
= 38. |
Arnica parryi |
Arnica acaulis |
|
Phenology | Flowering May–Sep. | Flowering Apr–Jun. |
Habitat | Open conifer forests to alpine meadows | Sandy pine woods and clearings, often in damp soils, chiefly on Coastal Plain |
Elevation | 500–3800 m [1600–12500 ft] | 0–300 m [0–1000 ft] |
Distribution |
CA; CO; ID; MT; NV; OR; UT; WA; WY; AB; BC; YT
|
DC; DE; FL; GA; MD; NC; NJ; PA; SC; VA
|
Source | FNA vol. 21, p. 373. | FNA vol. 21, p. 368. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. angustifolia subsp. eradiata, A. parryi subsp. sonnei, A. parryi var. sonnei | Doronicum acaule |
Name authority | A. Gray: Amer. Naturalist 8: 213. (1874) | (Walter) Britton: Prelim. Cat., 30. (1888) |
Web links |