524 CACTACEA, 
232. Mamillaria spinaurea, Salm Dyck in Otto & Dietr. Allg. Gartz. 1850, 
p- 50; Scheer in Seem. Bot. Voy. ‘ Herald,’ p. 288. 
Norra Mexico, probably Sonora or Durango (Potts). 
233. Mamillaria spinosissima, Lem. Cact. alig. Nov. Hort. Monv. fase. i. p- 4. 
Mexico. Hort. Kew. 
233*. Mamillaria squarrosa, Meinsh. in Koch’s Wochenschrift, ii. p. 116. 
Mexico (Karwinski). 
234. Mamillaria stella-aurata, Mart. in Zucc. Pl. Nov. fase. iii. p. 101. 
SourH Mexico, Zimapan (Ehrenberg). Hort. Kew. 
235. Mamillaria stenocephala, Scheidw. in Otto & Dietr. Allg. Gartz. ix. 
p. 43. | 
SoutH Mexico, in shady forest, under large pine and yew trees, on the Cerro de la 
Puerta de la Palma, between Zimapan and Jacola (Ehrenberg). 
236. Mamillaria strobiliformis, Scheer, ex Salm Dyck, Cact. ed. 2, p. 104, 
Norra Mexico, Chihuahua (Potts). 
237. Mamillaria stuberi, Férst. Handb. p- 517 ; Salm Dyck, Cact. ed. 2, p. 95. 
Mamillaria imbricata, Wegener, ex Salm Dyck, loc. cit. p. 11. 
MEXICco. 
238. Mamillaria subangularis, DC. Rev. Cact. p. 112, et Mém. p. 10. 
MEXIco, without locality (Coulter). Hort. Kew. 
239. Mamillaria subcrocea, DC. Rev. Cact. p. 110. 
Mexico, near Las Ajuntas, on the Montezuma river (Ehrenberg), without locality 
(Coulter). Hort. Kew. 
- 240. Mamillaria subechinata, Salm Dyck, Cact. ed. 2, p. 101. 
Sout Mexico, near Las Ajuntas, on the Montezuma river (Ehrenberg). 
241, Mamillaria subpolyedra, Salm Dyck, Hort. Dyck. p. 343; Cact. ed. 2, 
p. 120. 
Mamillaria polygona, Zucc., ex Pfeiff. Enum. p. 17. 
South Mexico, near Zimapan and Ismiquilpan, at the upper limits of the temperate 
regions (Ehrenberg). 
242. Mamillaria subtetragona, A. Dietr. in Otto & Dietr. Allg. Gartz. viii. 
p. 169. 
MExIco. 
243. Mamillaria subulifera, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. P. 242 ; 
Walp. Ann. ii. p. 274. 
MEXIco. 
