White-rayed pentachaeta

Chaetopappa bellidiflora (Greene) D. D. Keck

Plants 6–17 cm. Stems simple or with 1–2 primary branches, glabrous or sparsely hirsuto-pilose. Leaf blades linear, 8–45 × ca. 1 mm (glabrous or margins ciliate). Involucres campanulate. Phyllaries in 2–3 series, elliptic to obovate, glabrous. Ray florets 5–16; corollas white, sometimes reddish-tinged abaxially, laminae 3–6 mm. Disc florets 16–38; corollas yellow, narrowly funnelform, not contracted at lobes, lobes 5. P appi usually of 5 bristles slightly or not dilated at bases, rarely 0. 2n = 18.

Flowering Mar–May. Grassy, rocky areas; of conservation concern; 0–700 m; Calif.

Pentachaeta bellidiflora grows in the San Francisco Bay region.