Plants 60-200 cm. Stems villous, eglandular. Leaves oblong to oblanceolate (principal 3-nerved), (15-)20-45(-55) × (3-)5-13 mm, sharply serrate. 2n = 18.

Flowering (May-)Aug-Nov. Rocky slopes near beach, sea bluffs, brushy canyons, oak woodlands; 0-1000 m; Calif.

Subspecies plummerae occurs in the Santa Monica Mountains in Los Angeles County, Matilija Canyon in Ventura County, the western slopes of the Santa Ynez Mountains and Santa Cruz Island in Ventura County (R. M. Beauchamp and J. Henrickson 1996).