Arnica angustifolia

Vahl in G. C. Oeder et al.

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

Common names: Narrowleaf arnica
Synonyms: Arnica alpina subsp. angustifolia (Vahl) Maguire Arnica alpina var. angustifolia (Vahl) Fernald
Treatment appears in FNA Volume 21. Treatment on page 369. Mentioned on page 368.
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

V21-919-distribution-map.gif

North America, Europe, Asia.

Discussion

Subspecies 2 (2 in the flora).

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