United States, California, Nevada, Upstream from Long Valley Rd. along north bank Clear Creek. Ca. 5 km wsw Grass Valley.
39.182778 -121.139722 +-805m. NAD83
39§ 10m 58s N; 121§ 8m 23s W
485 meters (1591ft)
Riparian zone within blue oak woodland. Soil a sandy loam overlying serpentine bedrock. Petals yellow-gold with brown on back of two. Small population. (ca. 50).