16 September 2002.
California, United States
Locality: South bank (levee) of Lake Hennessey, north side of Highway 128 (across Conn Creek), 0.25 mile west of Lake Hennesy Spillway on Sage Canyon Road, ~2.5 miles east of Silverado Trail junction on Highway 128, Napa County.
Coordinates: 38.4869, -122.3889
(Map it)
Elevation: 91m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Seep area, roadside. Steep slope forming southern end of Lake Hennessey.
Comment: Population size 300.
Collector(s):