STANDLEY TREES AND SHRUBS OF MEXICO. 983 



Simple, subglobose, glaucous-green ; axils of young tubercles bearing white 

 wool, becoming naked ; tubercles large, 4-sided ; areoles when young white- 

 woolly, in age naked ; radial spines 7 to 10, grayish white, the three upper 

 smaller, the central recurved ; flowers described by Schumann as carmine- 

 colored. 



9. Neomammillaria magnimamma (Haw.) Britt. & Rose, Cactaceae 4: 

 77. 1923. 



Mammillarla magnimamma Haw. Phil. Mag. 63: 41. 1824. 



Mammlllaria divergens DC. Mem. Mus. Hist. Nat 17: 113. 1828. 



Mammillaria gladiata Mart. Nov. Act. Nat. Cur. 16: 336. 1832. 



Mammillaria ceratophora Lehm. Allg. Gartenz. 3: 228. 1835. 



Mammillaria reeurva Lehm. ; PfeifC. Enum. Cact. 15. 1837. 



Mammillaria Jiystrix Mart. ; PfeifC. Enum. Cact. 21. 1837. 



Mammillaria ehrenbergii Pfeiff. Allg. Gartenz. 6: 274. 1838. 



Mammillaria microceras Lem. Cact. Aliq. Nov. 6. 1838. 



Mammillaria deflexispina Lem. Cact. Aliq. Nov. 6. 1838. 



Mammlllaria versicolor Scheidw. Bull. Acad. Brux. 5: 494. 1838. 



IMammiUaria conopsea Scheidw. Bull. Acad. Brux. 5: 496. 1838. 



Mammillaria centricirrlia Lem. Cact. Gen. Nov. Sp. 42. 1839. 



Mammillaria neumatmiana Lem. Cact. Gen. Nov. Sp. 53. 1839. 



Mammillaria pentacantha Pfeiff. Allg. Gartenz. 8: 406. 1840. 



Mammillaria suhcurvata Dietr. Allg. Gartenz. 12: 232. 1844. 



Mammillaria diadema Miihlenpf. Allg. Gartenz. 13: 346. 1845. 



Mammillaria krameri Miihlenpf. Allg. Gartenz. 13: 347. 1845. 



Mammillaria foersteri Miihlenpf. Allg. Gartenz. 14: 371. 1846. 



mammillaria tetracentra Otto; Forst. Handb. Cact. 214. 1846. 



Mammillaria hockii Forst. Allg. Gartenz. 15: 50. 1847. 



Mammillaria pazzanii Stieber, Bot. Zeit. 5: 491. 1847. 



Mammillaria divaricata Dietr. Allg. Gartenz. 16: 210. 1848. 



Mammillaria Uopferiana Linke, Allg. Gartenz. 16: 329. 1848. 



Mammillaria glavca Dietr.; Linke. Allg. Gartenz. 16: 330. 1848. 



Mammillaria megacantha Salm-Dyck, Cact. Hort. Dyck. 1849. 123. 1850. 



Mammillaria uberimamma Monville ; Labour. Monogr. Cact. 120. 1853. 



"iMammillaria cirrosa Poselger, Allg. Gartenz. 21 : 94. 1853. 



Mammillaria pacliytele Poselger, Allg. Gartenz. 23: 17. 1855. 



Mammillaria lactescens Meinsh. Wochenschr. Gartn. Pflanz. 2: 117. 1859. 



Mammillaria geherweileriana Haage; Forst. Handb. Cact. ed. 2. 358. 1885. 



Mammillaria schmidtii Sencke; Forst. Handb. Cact. ed. 2. 876. 1885. 



Valley of Mexico, and elsewhere in central Mexico. 



Globose, the larger plants 10 cm. in diameter, sometimes solitary but oftener 

 cespitose with 25 in a cluster or more, very milky throughout ; tubercles conic 

 or somewhat flattened or faintly 4-angled, 1 cm. long, the axils when young 

 densely woolly ; spines 3 to 5, very unequal, the upper ones short and straight, 

 the lower one or two 1.5 to 2.5 cm. long, recurved or incurved, all horn-colored, 

 with black tips ; flowers cream-colored ; fruit clavate, 2 cm. long, crimson ; seeds 

 brownish. 



10. Neomaminillaria macracantha (DC.) Britt. & Rose, Cactaceae 4: 79. 1923. 

 Mammillaria macracantha DC. Mem. Mus. Hist. Nat. 17: 113. 1828. 

 Cactus alternatus Coulter, Contr. U. S. Nat. Herb. 3: 95. 1894. 

 San Luis Potosl. 



