United States, Texas, McMullen, 3.2 mi. NE of Park Rd. 7 from its Jct. Hwy 72, then 0.10 mi. W on an un-named paved road from its Jct. with Park Rd. 7. On rocky hillside above Choke Canyon Reservoir.
28.352688 -98.567841 +-10000m.
Associates include Acacia rigidula, Pennisetum ciliare, and Cenchrus spinifex.