Arnica angustifolia
in G. C. Oeder et al., Fl. Dan. 9(26): 5, plate 1524. 1816.
Plants 5–40 cm. Stems usually simple, rarely branched. Leaves 1–5 pairs, mostly cauline; petiolate (petioles broadly to narrowly winged, shorter than blades); blades broadly lanceolate to linear, 2–20 × 0.3–4 cm, margins entire or irregularly denticulate or dentate, apices acute or acuminate, faces glabrous or densely woolly-villous and stipitate-glandular. Heads 1–3 (–5; erect). Involucres hemispheric. Phyllaries 9–22, usually narrowly to broadly lanceolate, sometimes oblanceolate. Ray-florets 6–16; corollas yellow. Disc-florets: corollas yellow; anthers yellow. Cypselae brown, 3–8 mm, densely hirsute, rarely glandular; pappi white, bristles barbellate.
Distribution
Alta., B.C., Man., N.W.T., Nfld. and Labr. (Nfld.), Nunavut, Ont., Que., Sask., Yukon, Alaska, Mont., Europe, Asia
Discussion
Subspecies 2 (2 in the flora).
Selected References
None.
Key
| 1 | Leaves linear to broadly lanceolate, faces glabrousor moderately villous | Arnica angustifolia subsp. angustifolia |
| 1 | Leaves narrowly lanceolate, faces densely white-woolly-villous | Arnica angustifolia subsp. tomentosa |