15 September 2004.
California, United States
Locality: Brown Island, Sacramento River Delta, Contra Costa County.
Coordinates: 38.0436, -121.8708
(Map it)
Elevation: 4m.
Georeference protocol: Lat/lon determined by GPS
Environment description: Marshy river delta island.
Number of plants sampled: 100
Comment: Boat access only (island); population >1000.
Collector(s):