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

25. Arnica gracilis Rydberg, Bull. Torrey Bot. Club. 24: 297. 1897.

Smallhead arnica

Arnica latifolia Bongard var. gracilis (Rydberg) Cronquist

Plants 10–30 cm. Stems (often 5–10 in dense clumps) branched distal-ly. Leaves 2–3 pairs, mostly cauline (basal leaves often persistent on sterile rosettes, similar to cauline leaves); petiolate (petioles narrowly to broadly winged, distal pair of leaves often reduced, connate-perfoliate); blades ovate to ovate-lanceolate, 2–6 × 1–3 cm, margins irregularly serrate to subentire, apices acute, faces: abaxial glandular, adaxial stipitate-glandular. Heads (1–)5–15. Involucres turbinate-campanulate. Phyllaries 10–16, ovate-lanceolate. Ray florets 5–12; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae black, 4.5–7 mm, hairy (hairs duplex) and stipitate-glandular; pappi white, bristles barbellate. 2n = 57, 76.

Flowering Jul–Aug. Dry, exposed, rocky, alpine slopes, sometimes subalpine meadows; 1200–2500 m; Alta., B.C.; Idaho, Mont., Oreg., Utah, Wash., Wyo.


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