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

23. Arnica venosa H. M. Hall, Univ. Calif. Publ. Bot. 6: 174. 1915.

Shasta County arnica

Plants 20–60 cm. Stems simple or branched (prominently ribbed; caudices woody). Leaves 6–10 pairs, cauline (basal leaves withered by flowering; proximal cauline scalelike, middle leaves largest, distal reduced, bractlike) usually broadly sessile, rarely broadly petiolate; blades (3- or 5-nerved, strongly reticulate-veined) ovate-elliptic to broadly lanceolate, 3–7 × 1.5–4 cm (firm), margins irregularly and coarsely serrate, apices acute to obtuse, faces: abaxial pilose, stipitate-glandular (especially on veins), adaxial glabrate to stipitate-glandular. Heads 1. Involucres turbinate-campanulate. Phyllaries 8–19, ovate to broadly lanceolate. Ray florets 0. Disc florets 30–60; corollas yellow; anthers yellow. Cypselae dark gray, 6–8 mm, densely hirsute (hairs duplex); pappi white, bristles barbellate. 2n = 38.

Flowering May–Jun. Open, often disturbed, oak-pine forests; 400–1400 m; Calif.

Arnica venosa is known only from Shasta and Trinity counties.


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