Phytologia 68: 268. 1990
Phenology: Flowering Jun–Jul.
Habitat: Open, sandy areas, chaparral, woodlands
Elevation: 700-3400 m
Ariz., Calif., Mexico (Baja California).
Some authorities recognize varietal segregates in this species based on minor characters that appear to exhibit much variation from population to population; they are not treated in this account.