By John M. Coulter
Contributions from the U.S. nationwide Herbarium, 1894.
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Coahuila and San Luis Potosi, to southern Mexico. Specimens examined: Coahuila (Poselger, without number or date): San Luis Potosi (Parry & Palmer 271; Parry of 1878; Weber): Mexico, no State mentioned (Palmer of 1872). The spine measurements are taken from small specimens. One of the largest of the genus. 7. ) Salm, Cact. Hort. Dyck. ed. 1, 22 (1844). Astrophytum myriostigma Lem. Cact. Gen. Nov. 4 (1839). : Scheidw. Bull. Acad. Brux. vi, 88 (1839). 5 cm. in diameter: ribs 5 or 6, very broad, covered with numerous somewhat pilose white spots, and with deep, obtuse sinuses: spines none; flowers large, pale-yellow.
These forms have been variously referred to Anhalonium and Echinocactus, but seem to deserve generic distinction. They differ from Anhalonium in the entire suppression of the upper highly differentiated portion of the tubercle, in the broad and rounded development of the lower portion, and in the coalescence of the enlarged tubercles into broad vertical ribs. In fact, in young specimens, the plant appears almost smooth, with shallow furrows radiating from the depressed apex. The genus differs from Echinocactus in the suppression of the spine-bearing areolae, and the naked ovary.
Long. (Ill. Cact. Mex. Bound. t. 31 and 32, figs. 1-5)—Type unknown. The Wright and Wislizenus specimens in Herb. Mo. Bot. Gard. are types of centrispinus Engelm. 360 On stony ground, between the Pecos and Rio Grande in southwest era Texas and southern New Mexico, and extending southwest into Chihuahua, Coahuila, and San Luis Potosi. Specimens examined: Texas (Wright of 1849, 1851, 1852; Lemmon of 1881; G. R. ) The distinction between horizonthalonius and centrispinus is an untenable one, being simply the presence or absence of the central spine.
A Preliminary Revision of the North American Species of Cactus... by John M. Coulter