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.
Revision as of 18:50, 24 September 2019 by FNA>Volume Importer

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).

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