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By John M. Coulter

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

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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. 5 to 3 mm. long. (Ill. Cact. Mex. Bound. t. 31 and 32, figs. 1-5)—Type unknown. The Wright and Wislizenus specimens in Herb. Mo. Bot. Gard. 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.

M. strobiliformis Muhlenpf. is C. scolymoides sulcatus; and M. strobiliformis Engelm. is C. conoideus. 57. Cactus viviparus Nutt. in Fraser’s Cat. (1813). Mamillaria vivipara Haw. Syn. Succ. Suppl. 72 (1819). Low and depressed-globose, usually proliferous and cespitose (forming large masses), but sometimes simple: tubercles terete and loose, lightly grooved: radial spines 12 to 20, stiff and white, often dark-tipped, 6 to 8 mm. long; central spines usually 4 (sometimes less, often more, even as many as 8), brownish, 8 to 12 mm.

Maculatus (52). Radials 13 to 16. compactus (44). * * * Central spine solitary and hooked. brunneus (53). 126 * * * * Central spines more than one and none of them hooked. Centrals 2: radials 6 to 20. scheerii (40), robustispinus (41), recurvatus (42), scolymoides (48). Centrals 3: radials 6 to 40. scheerii (40), scolymoides (48), echinus (50), conoideus (54), neo-mexicanus (59), arizonicus (60). Centrals 4 or 5: radials 6 to 40. scheerii (40), scolymoides (48), echinus (50), conoideus (54), tuberculosus (56), viviparus (57), radiosus (58), neo-mexicanus (59), arizonicus (60), macromeris (64).

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