Related species: Downingia bicornuta var. bicornuta Downingia bicornuta var. picta
Plant Communities: Valley Grassland Foothill Woodland Yellow Pine Forest wetland-riparian
Counties: Amador Butte El Dorado Fresno Lake Lassen Madera Merced Modoc Napa Placer Plumas Riverside Sacramento San Joaquin Shasta Sierra Siskiyou Solano Sonoma Stanislaus Sutter Tehama Yolo Yuba