By John M. Coulter
Contributions from the U.S. nationwide Herbarium, 1894.
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Additional info for A Preliminary Revision of the North American Species of Cactus...
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. Dr. Engelmann had reached the same conclusion after examining a large amount of both living and dried material in European collections.
Gartenb. Ver. 3, 420, t. 13 (1827). —Astrophytum Lem. (1839); Gymnocalycium Pfeiff. (1844); Malacocarpus Salm-Dyck (1850). † As the genera of Cactaceæ have no very definite boundaries it is to be expected that Echinocactus will be found merging into neighboring genera. The mamillate forms, such as E. simpsoni, are clearly intermediate between Cactus and Echinocactus, but are nearer the latter in what are considered the more essential characters; while the oval and cylindric forms look toward certain species of Cereus, though the general globose outline is well maintained.
At Carneros Pass, Coahuila. Specimens examined: Coahuila (Pringle 2580 of 1889). The type of this species was not among the collections received from Cambridge, but a specimen of the same distribution from the National Herbarium shows tubercle dimensions different from those recorded in Dr. Watson’s description. In that description the triangular terminal surface is said to be “about an inch broad by one-half inch,” which is decidedly different from the equilateral surface of the tubercle of prismaticum.