. Carnegie Institution of Washington publication. WILCOXIA. Ill Herbarium of the Museum of Paris, where it was examined by Dr. Rose in 1912. It is the same as C. A. Purpus's No. 3301 collected at the type locality in 1908 and distributed in his sets of specimens. It is called in Mexico organito de vibora. The plant is remarkable among Cereeae in having puberulent stems. We include it in Wilcoxia, but are uninformed as to the characters of the roots, which are tuberous in the other species. Figure 163 shows pieces of the stem, from an herbarium specimen collected by C. A. Purpus at the type loc
. Carnegie Institution of Washington publication. WILCOXIA. Ill Herbarium of the Museum of Paris, where it was examined by Dr. Rose in 1912. It is the same as C. A. Purpus's No. 3301 collected at the type locality in 1908 and distributed in his sets of specimens. It is called in Mexico organito de vibora. The plant is remarkable among Cereeae in having puberulent stems. We include it in Wilcoxia, but are uninformed as to the characters of the roots, which are tuberous in the other species. Figure 163 shows pieces of the stem, from an herbarium specimen collected by C. A. Purpus at the type locality. 1. Wilcoxia poselgeri (Lemaire) Britton and Rose, Contr. U. S. Nat. Herb. 12: 434. 1909. Cereus tuberosus Poselger, Allg. Gartenz. 21: 135. 1853. Not Pfeiffer, 1837. Echinocereus poselgeri Lemaire, Cact. 57. 1868. Echinocereus tuberosus Riimpler in Forster, Handb. Cact. ed. 2. 783. 1885. Cereus poselgeri Coulter, Contr. U. S. Nat. Herb. 3: 398. 1896. Roots tuberous, black, several, near the surface of the ground; stems 60 cm. high or less, 6 to 10 mm. thick, with 8 to 10 inconspicuous ribs, the lower and older parts naked, spiny above, the spines almost hiding the ribs; radial spines 9 to 12, appressed, 3 to 5 mm. long, delicate, puberulent; central one ascending, black-tipped, about i cm. long, stouter than the radials; flowers purple or pink, 5 cm. long, spines of ovary and flower-tube intermixed with white hairs; perianth-segments linear, acuminate, about cm. long, widely spreading or strongly recurved; style pale green; stigma-lobes slender, green; seeds pitted or rugose, 8 mm. long. Type locality: Texas. Distribution: Southern Texas and Coahuila. This cactus does not grow well on its own roots in green- house cultivation, but gradually loses its vitality; we have had plants, however, to persist in cultivation for ten years. If grafted on cuttings of Seleniccrcus ptcranthus, very vigorous plants can be developed, which will flower each year. It is sometimes calle
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