Arnica venosa

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.