Outer tepals deeply 2-lobed, occasionally erose apically. 2n = 40.

Flowering May-Aug. Sandy, gravelly or clay soils, grassland communities, pine-oak wood-lands; 200-700 m; Calif.

Variety biloba is found from the eastern foothills of the Santa Lucia Mountains of Monterey and San Luis Obispo counties eastward to the western foothills of the Diablo, La Panza, and Temblor ranges, and in extreme western Fresno County.