CACTACEA. 515 
Norta Mexico, from El Paso to the San Pedro river, also in a single locality east of 
this river (only on limestone, never in the porphyritic region, Wright). 
Var. B. greggii, Engelm. loc. cit. et Synop. Cact. U.S. &c. p. 5. 
Nort Mexico, mountain-ridge between Azufrora and Penos Bravos, near Saltillo 
(Greqq). 
143. Mamillaria minima, Rchb. in Terscheck, Suppl. Cact. p. 1; Walp. Rep. 
li. p. 301. 
SoutH Mexico, near Zimapan, on the Caracol (Ehrenberg). Hort. Kew. 
144, Mamillaria mirabilis, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. p. 261; 
Walp. Ann. ii. p. 676. 
MExIco. 
145. Mamillaria mucronata, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. p. 294; 
Walp. Ann. ii. p. 677. 
Mexico. 
146. Mamillaria mithlenpfordtii, Forst. in Otto & Dietr. Allg. Gartz. xv. p. 49. 
Mexico. 
146*, Mamillaria multiceps, Salm Dyck, Cact. ed. 2, p. 81; ‘Koch’s Wochen- 
schr. i. p. 27. 
Mexico (Karwinski). Hort. Kew. 
147. Mamillaria multiseta, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. p. QA2; 
Walp. Ann. ii. p. 674. | 
Mexico. 
148. Mamillaria mutabilis, Scheidw. in Otto & Dietr. Allg. Gartz. ix. p. 43; 
Walp. Rep. ii. p. 298. 
Mexico. Hort. Kew. 
149. Mamillaria mystax, Mart. in Act. Nov. Nat. Cur. xvi. pars 1, p. 332, t. 21. 
Sourn Mexico, Ismiquilpan and San Pedro Nolasco, at about 6000 feet (Karwinskt), 
Oaxaca (Ehrenberg). 
150. Mamillaria neumanniana, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. p. 53. 
Mamillaria conopsea, Hort. Berol. nec Scheidw., ex Ehrenberg in Linnea, xix. 350. 
Sourn Mexico, Barrancas near Mestitlan and Ismiquilpan (Ehrenberg). Hort. Kew. 
151. Mamillaria nigra, Ehrb. in Otto & Dietr. Allg. Gartz. 1849, p. 287; 
Salm Dyck, Cact. ed. 2, p. 94. 
MExIco. | 
152. Mamillaria nigricans, Fennel in Otto & Dietr. Allg. Gartz. xv. p. 66; 
Pfeiffer & Otto, Abbild. ii. t. 23. 
MEXICO. 
3u 2 
