Parent species: Polygonum aviculare
Counties: Alameda Butte Contra Costa Colusa Fresno Humboldt Inyo Kern Lake Los Angeles Marin Mariposa Mendocino Merced Mono Monterey Modoc Napa Nevada Orange Plumas Riverside Sacramento Santa Barbara San Bernardino Santa Clara Santa Cruz San Diego San Luis Obispo San Mateo Shasta Sierra Siskiyou Solano Sonoma Stanislaus Sutter Ventura Yolo