By John M. Coulter

Contributions from the U.S. nationwide Herbarium, 1894.

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Extra resources for A Preliminary Revision of the North American Species of Cactus...

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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. Specimens examined: Arizona (Cous of 1865; Cous & Palmer of 1865 and 1872; Palmer of 1869; Bischoff of 1871; Miller of 1881; Rusby 617 of 1853; Pringle of 1884): Utah (Johnson of 1871, 1872, 1874; Parry of 1875, 1877): California (Parish of 1880): also specimens cultivated in Mo.

The northern plains, and the desert region of western Arizona and adjacent California, Nevada, and Utah. In the former region is found the widespread viviparus, which extends from the southern borders of British America to the plains of eastern Colorado and western Kansas, and even crosses the Rocky Mountain divide into northern Idaho and northeastern Washington; and missouriensis, which also ranges from the high prairies of the Upper Missouri to the same southern limit, and is continued southward into Texas in its varieties similis and robustior.

Cact. 277 (1856). Echinocactus laticostatus Engelm. & Bigel. Pacif. R. Rep. iv, 32 (1856). Glaucous, depressed-globose or at length ovate or even cylindric with age, 4 to 20 cm. 5 to 15 cm. in diameter, simple: ribs 8 to 10 (fewer in very young specimens), often spirally arranged, the tubercles scarcely distinct by inconspicuous transverse grooves: spines 6 to 9, stout, compressed, reddish (at length ashy), recurved or sometimes almost straight, nearly equal, 2 to 4 cm. long (sometimes long and slender and almost terete, sometimes short, stout and broad); radials 5 to 8, upper ones weaker, lowest wanting; a single stouter decurved central (sometimes wanting): flowers pale-rose to purple, 6 cm.

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