USA, California, Riverside, Sonoran (Colorado) Desert; South Palen Lake, Chuckwalla Valley, 5.0 km SE of Sidewinder Well, 2.4 km SW of Palen Dunes Dr., and 3.7 km N of Interstate 10
Annual, fls white with yellow fornices, this coll. robust-spreading, locally common. Growing on northwest-sloping alluvial fan leading into playa basin, on sand field swales and dunes where it occurs with C. costata.