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FNA | Family List | FNA Vol. 21 | Asteraceae | Arnica

4. Arnica angustifolia Vahl in G. C. Oeder et al., Fl. Dan. 9(26): 5, plate 1524. 1816.

Narrowleaf arnica

Arnica alpina subsp. angustifolia (Vahl) Maguire; A. alpina (Linnaeus) Olin & Ladau var. angustifolia (Vahl) Fernald

Plants 5–40 cm. Stems usually simple, rarely branched. Leaves 1–5 pairs, mostly cauline; petio-late (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.

Subspecies 2 (2 in the flora): North America; Europe; Asia.

1 Leaves linear to broadly lanceolate, faces glabrousor moderately villous   4a Arnica angustifolia subsp. angustifolia
+ Leaves narrowly lanceolate, faces densely white-woolly-villous   4b Arnica angustifolia subsp. tomentosa


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