Mexico, Coahuila, About 2 km S of the pass at Cuesta La Muralla on Hwy #57 between Saltillo and Monclova. Hill sloping to the W and just N of old rock quarry.
26.383333 -101.416667
26d 23m N; 101d 25m W
1250 meters (4100ft)
Hill, limestone soil, Chihuahuan Desert shrub.
Stems
KM marker 120.5. Ex Whitman College Herbarium Specimen 10887.