Related species: Calystegia collina ssp. tridactylosa Calystegia collina ssp. oxyphylla Calystegia collina ssp. collina Calystegia collina ssp. venusta
Synonyms: Convolvulus collinus Convolvulus malacophyllus ssp. collinus
Counties: Alameda Colusa Fresno Glenn Kings Kern Lake Marin Mendocino Monterey Napa Nevada Santa Barbara San Benito Santa Clara San Luis Obispo San Mateo Solano Sonoma Ventura Yolo