520 | CACTACEA, 
191. Mamillaria pycnacantha, Mart. in Act. Nov. Nat. Cur. xvi. pars 1, 
p. 325, t. 17; Bot. Mag. t. 3972; Pfeiffer & Otto, Abbild. i. t. 26. 
Mamillaria latimamma, DC. Rev. p. 114? 
Sour Mexico, near the city of Mexico, 7000 feet (Karwinski), Pachuca, 7500 feet, 
Regla, &c. (Ehrenberg), common between Tacubaya and Santa Fé (Bourgeau, 306). 
~ Hort. Kew. 
192. Mamillaria pyrrhocephala, Scheidw. in Otto & Dietr. Allg. Gartz. ix. cP 42. 
SoutH MExI00, Real del Monte, above 6000 feet (Galeotti). 
193. Mamillaria pyrrhochroacantha, Lem. Cact. Gen. Nov. et Sp. Hort. 
Monv. p. 51. 
Mexico 2? 
194. Mamillaria quadrispina, Mart. in Act. Nov. Nat. Cur. xvi. pars 1, p. 329. 
South Mexico, Ismiquilpan (Karwinski). 
195. Mamillaria radians, DC. Rev. Cact. p. 111; Salm Dyck, Cact. ed. 2, 
p. 105. 
‘SourH Mexico, in the valley of Zimapan (Ehrenberg), without locality (Coulter). 
Hort. Kew. | 
Var. £. globosa, Scheidw. in Bull. Acad. Brux. v. p. 494. 
MeExioo. 
196. Mamillaria raphidacantha, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. p. 34. 
Mamillaria ancistracantha, Lem. loc. cit. p. 36. 
Mawmillaria clavata et M. stipitata, Scheidw. ex Labour. Cact. p. 128. 
Nortu Mexico, several varieties received from San Luis Potosi (Ehrenberg). Hort. Kew. 
197. Mamillaria recurva, Lehm. ex Pfeiff. Enum. p. 15. 
Mamillaria lehmannii, Hort., ex Pfeiff. loc. cit. 
SoutH Mexico, near Pachuca, at 7500 feet, near Los Bafios de Atotonilco el Grande, 
at 6000 feet, near Zimapan, &c. (ex Ehrenberg). 
198. Mamillaria recurvispina, Engelm. Cact. U.S. et Mex. Bound. Surv. p. 12. 
Norta Mexico, eastern parts of Sonora Alta, especially in the Sierra del Pajarito 
(Schott). 
199. Mamillaria recurvispina, Vriese in Tijdschrift Nat. Gesch. vi. p. 53, ti. 
fig. 3. 
MEXIco. 
200. Mamillaria regia, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. p. 269. 
MExi00. 
201. Mamillaria retusa, Hort. Belg., ex Pfeiff. in Otto & Dietr. Allg. Gartz. v. 
p. 369. 
MeExico. 
