502 CACTACEA, 
1. Melocactus curvispinus, Hort. Berol., ex Pfeiff. Enum. p. 46 ; Lab. Monogr. 
p. 18. | 
- Mexico. | 
2. Melocactus delessertianus, Lem., ex Labour. Cact. p. 20, absque descr. 
Mexico. 
3. Melocactus ferox, Pfeiff., ex Labour. Cact. p. 16. 
Echinocactus spina-christi, Zucc. in Pfeiff. Enum. p. 59. 
Echinocactus armatus, Salm Dyck, ex Labour. loc. cit. 
Mexico, in temperate regions near Santa Rosa de Toliman.—It is said to occur also 
in Sout Brazit, to which country it may be limited. (See under Echinocactus spina- 
christi.) 
4. Melocactus mamillarieformis, Salm Dyck in Otto & Dietr. Allg. Gartz. 
1836, p. 148. 
Melocactus cephalophora, Salm Dyck, Cact. ed. 2, p. 187. 
Mexico (Karwinski). 
2. MAMILLARIA. 
Mamillaria, Haw. Syn. Pl. Succ. p. 177; Benth. et Hook. Gen. Plant. i. p. 847. 
Upwards of 300 forms have been described as species. They inhabit Mexico and 
the countries immediately to the north; and a few occur in the West Indies, Bolivia, 
and Brazil. 
1. Mamillaria acanthophlegma, Lehm. Delect. Sem. Hamb. 1833; Pfeiff. 
Enum. p. 26. 
Mamillaria recta, Mig., ex Labour. Cact. p. 63. 
Mamillaria geminispina, DC. Rev. Cact. p. 30, t. 8, nec Haworth, ex Pfeiffer, loc. cit. 
Sovurn Mexico, regions of Yavesia, Oaxaca (Karwinski)—Gyrows in several varieties 
at Pedregal de San Antonio, near the chief city (Ehrenberg). Hort. Kew. 
2. Mamillaria acanthostephes, Lehm. in Otto & Dietr. Allg. Gartz. 1835, 
p. 228; Pfeiff. Enum. p. 16. 
MEXxIco. 
3. Mamillaria acicularis, Lem. Cact. Gen. et Sp. Nov. p. 34. 
MEXIco. 
4, Mamillaria aciculata, Otto, ex Pfeiff. Enum. p. 29. 
Mexico. 
5. Mamillaria actinoplea, Ehrb. in Otto & Dietr. Allg. Gartz. xvi. p. 266. 
Mexico. 
6. Mamillaria eruginosa, Scheidw. in Otto & Dietr. Allg. Gartz. vii. p. 338. 
SoutH Mexico, State of Oaxaca (Ehrenberg). 
