United States, California, Lassen, Modoc Plateau; Big Valley, Ash Creek State Wildlife Area, 6.0 air-mile southwest of Adin, 5.6 air-miles northeast of Bieber; northeast of Wayman Barn; south side of Big Valley Canal. T39N, R8E, se 1/4 Sec. 33; Big Swamp 7.5' Quad.