Collected
13 July 1990.
Texas, United States
Locality: Brewster Co., Hwy 170, along Terlingua Creek, 5.4 mi. W of jct. Hwy 118 at Study Butte.
Environment description: Gravelly limestone soil. Chihuahuan Desertscrub with Acacia greggii, A. neovernicosa, Prosopis glandulosa var. glandulosa, Guaiacum angustifolium, Larrea divaricata subsp. tridentata.