Mexico, Coahuila, Perros Bravos, hill to the immediate NE of the abandoned railroad station.
25d 52.5m N, 100d 57.5m W
850 meters (2788ft)
Rocky hillside of light brown-oxidized limestone.
Aloe barbados, Echinocactus horizonthalonius, Echinocactus stramineus, Fouquieria splendens, Jatropha dioica, O. bulbispina, O. kleiniae, O. leptocaulis, O. rufida, Prosopis glandulosa
Apparently clonal shrub 1.8 m tall from three trunks, the largest 12 cm diameter with dark gray rough bark, younger bark rather smooth, gray-brown with withered spines, older stems with proliferating spines; young branches gray-green, the smaller easily detached; spines pale straw-colored; sheath even paler, both rather uniform in color; fruit obovoid to globose, to 4 cm diameter, smooth, except for uppermost areoles; flowers red-purple.
Paredon 1:50,000 cetenal quadrangle; N28 63 200 E03 03 115 (NAD 83); n=11 during meiosis of microgametogenesis