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...
Ill. Monats. Kakteenkuude, October, 1891)—Type unknown. 132 Along both sides of the Lower Rio Grande. Specimens examined: Texas (Win. Lloyd of 1890, mouth of the Pecos; Mrs. Nickels of 189, 1893): Mexico (specimen collected across the Rio Grande, near Laredo, in 1894): also growing in Mo. Bot. , 1893. The extreme specific and varietal forms seem worthy of specific distinction, but abundant growing material in Mo. Bot. Gard. showed such complete intergradation that a specific line of separation was found to he impossible.
T. 27)—Type, LeConte 11 in Herb. Mo. Bot. Gard. Rocky ground, from southwestern Utah and southern Nevada through western Arizona and adjacent California to Sonora and Lower California. Apparently not east of the Great Basin. Specimens examined: Utah (Palmer of 1877; Siler): Arizona (LeConte 11; Bigelow of 1854; Newberry of 1858; Palmer of 1867, 1869, 1874; Parry of 1881; Pringle of 1881; Evans of 18t)1): California (Parish of 1880; G. R. Vasey of 1880): Sonora (Palmer of 1869): Lower California (Brandegee of 1889, at Boca dc Las Animas, San Gregorio, and Posa de Los Dolores).
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. In the National Herbarium specimen of furfuraceum, however, of the same distribution, the surface is almost equilateral, measuring 15 mm. long by 18 mm. wide at base. Without the acuminate upper portion the breadth of the triangular portion would be about double its length. The lower rim of the cup-like depression which terminates the tubercle and contains the pulvillus is sometimes slightly prolonged into a tooth, which in prismaticum becomes the sharp tip of the tubercle.