United States, California, Mendocino County, Mendocino County: Hopland, Hopland Field Station. (Exact location unknown. Coordinates estimated by label maker.)
39.001944 -123.084722 +-875m. WGS84
39° 7s N; 123° 5m 5s W
In shallow, red-purplish soil with pH 5.5, in shade on south-facing slope (more common out of shade).