perennial on crust of weathered gypsum over anhydrite gypsum and calcareous shaley limestone of the Castile Formation, with other gypsophilic plants Anulocaulis leiosolenus v. gypsogenus, Nama carnosum, and Tiquilia hispidissima, Bouteloua breviseta
roadside on small volcanic gravels and coarse sand of shallow arroyo crossing. Appears to be var. austrinus. NOTE: pink, blue and white flowers on same plant
plants on an open exposed rockface of gypseous limestone of a foothill on the NW edge of the Sierra Parras, with Jatropha dioica, Agave asperrima, Opuntia rufida, Sericodes greggii, Sengalia crassifolia.