United States, Texas, Presidio, Chinati Mtns. State Natural Area. Along a small arroyo which drains the Cienega to the SE.
29.90139 -104.56278
Outcrops of red and grayish rock. Associates include Fouquieria, Opuntia imbricata, Jatropha dioica, and Forestiera on rocky fingers. Sporobolus airoides dominant in drainage. Erect annual growing in fine-grained soils in shade of Prosopis.