By John M. Coulter
Contributions from the U.S. nationwide Herbarium, 1894.
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Specimens examined: Texas (Lindheimer of 1846): New Mexico (Bigelow of 1855): Chihuahua, near Juarez (Evans of 1891): also specimens cultivated from the type in St. Louis in 1846. Attention has been called under C. viviparus to the characters that distinguish from C. radiosus The characters there given for the latter species apply to the whole group of included forms. The type of the species is the var. Texana of Engelmann’s Syn. Cact. and Mex. , which is characterized in the above description.
A summarized statement of the distribution of our twelve Eumamillaria would be that two of them have extended from the low grounds of Coahuila and Chihuahua and spread along the valley of the Rio Grande; nine have come from the high grounds of Chihuahua and Sonora, four of which have extended eastward to the low levels of southeastern Texas; four have kept to the highlands west of the Pecos, and one has kept to the Colorado Valley and its tributaries, while one has a short northern extension from Lower California.
It is through this variety that C. radiosus approaches most nearly to C. viviparus, in the forms with few radials and centrals, but the specific characters seem to hold. This is the Mamillaria vivipara of the Syn. Fl. Colorado (Porter and Coulter). 121 60. ). Mamillaria arizonica Engelm. Bot. Calif. i. 244 (1876). 5 to 10 cm. —Type, the specimens of Cous, Palmer, Bischoff and Johnson, all in Herb. Mo. Bot. Gard. Sandy and rocky soil from southern Utah through northern and western Arizona to southern California.