Leptosyne gigantea Kellogg, Proc. Calif. Acad. Sci. 4: 198. 1872

Subshrubs or shrubs (± pachycaul, fleshy), (10–)30–250+ cm. Leaf lobes mostly filiform, 10–35(–75) × 0.5–1(–2) mm. Heads (1–)8–12+ per stem. Peduncles 4–12(–18+) cm. Calyculi of 4–12+ ovate to linear bractlets (5–)7–12+ mm. Phyllaries 8–14+, lance-ovate, 10–12+ mm. Ray florets 8–13+; laminae 20–35+ mm. Disc corollas 5–6 mm. Cypselae oblong-obovate, 5–7 mm. 2n = 24.

Flowering Jan–Jul. Coastal bluffs, dunes; 0–200 m; Calif.; Mexico (Baja California).