By John M. Coulter

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

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Radials 10 to 17. missouriensis (37), similis (38), macromeris (64). Radials 30 to 50, capillary. dasyacanthus (51). † * * Central spine solitary, not hooked. Central spine porrect. † † Radials 6 to 17. missouriensis (37), robustior (39), scheerii (40). Radials 30 to 50, white and capillary. dasyacanthus (51). Central spine curved downwards. † † † Radials 8 to 12. sulcatus (49). Radials 12 to 26. robustispinus (41), recurvatus (42), corniferus (47), scolymoides (48). Central spine erect: Mexican.

5 cm. long, about the same diameter when fully open, violet to dark purple: stigmas 7 to 9, obtuse: fruit oval and green: seeds yellowish or brown, obovate, pitted, fully 2 mm, long. (Ill. Cact. Mex. Bound. t. 74, fig. 5, seeds)—Type, Lindheimer of 1846 in Herb. Mo. Bot. Gard. Extending across southern Texas, from the Guadalupe to El Paso. thence into contiguous New Mexico and across the Rio Grande near Juarez (northern Chihuahua). Fl. May-June. Specimens examined: Texas (Lindheimer of 1846): New Mexico (Bigelow of 1855): Chihuahua, near Juarez (Evans of 1891): also specimens cultivated from the type in St.

196 (1850). Mamillaria vivipara radiosa texana Engelm. Syn. Cact. 269 (1856). 5 cm. high and about 5 cm. in diameter, simple or sparingly proliferous: tubercles terete, more or less grooved above, 8 to 12 mm. long: radial spines 20 to 30, straight, slender, white with dusky apex, very unequal, 6 to 8 mm long; central spines 4 or 5, stouter, yellowish or tawny, 8 to 12 mm. 5 cm. long, about the same diameter when fully open, violet to dark purple: stigmas 7 to 9, obtuse: fruit oval and green: seeds yellowish or brown, obovate, pitted, fully 2 mm, long.

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A Preliminary Revision of the North American Species of Cactus... by John M. Coulter


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