. The Cactaceae : descriptions and illustrations of plants of the cactus family. CORYPHANTHA. 29 There has been considerable confusion regarding this species, which was first described as Mammillaria scheeri by Miihlenpfordt in 1847, but this proved to be a homonym. This led Poselger in 1853, when he transferred the species to Echinocactus, to publish it as E. muehlenpfordtii. Dr. Engelmann in 1856 described a variety of Mammillaria scheeri, calling it valida. Some time afterwards he compared this variety with the type of the species and decided that they were the same. We have examined severa
. The Cactaceae : descriptions and illustrations of plants of the cactus family. CORYPHANTHA. 29 There has been considerable confusion regarding this species, which was first described as Mammillaria scheeri by Miihlenpfordt in 1847, but this proved to be a homonym. This led Poselger in 1853, when he transferred the species to Echinocactus, to publish it as E. muehlenpfordtii. Dr. Engelmann in 1856 described a variety of Mammillaria scheeri, calling it valida. Some time afterwards he compared this variety with the type of the species and decided that they were the same. We have examined several specimens from near the type locality of the variety valida, which is near El Paso, Texas. It is possible that Scheer's plant was a very young one, which might account for the differences in form and spines. The Mammillaria scheeri of Schumann's Monograph is a complex of 4 or 5 distinct species. Illustrations: Allg. Gartenz. 15: 97. pi. 2; Forster, Handb. Cact. ed. 2. 406. f. 44; Schumann, Gesamtb. Kakteen 485. f. 80; Monatsschr. Kakteenk. 8: 23; 10: 127; Schelle, Handb. Kakteenk. 237. f. 153, as Mammillaria Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Britton, Nathaniel Lord, 1859-1934; Rose, J. N. (Joseph Nelson), 1862-1928. Washington : Carnegie Institution of Washington
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