CACTACEA. 521 
202. Mamillaria rhodeocentra, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. 
p. 52; Salm Dyck, Cact. ed. 2, p. 108. 
MExico. 
Var. 6. gracillima, Scheer in Seem. Bot. Voy. ‘ Herald,’ p. 288. © 
Norra Mexico, Chihuahua (Potts). 
208. Mamillaria rhodantha, Link et Otto, Ic. Pl. Rar. t. 26 ; Salm Dyck, Cact. 
ed. 2, p. 97; Pfeiff. Enum. p. 31. 
Souta Mexico, frequent in the Pefion Grande, Pefion de los Bafos, and many other 
places (Ehrenberg), Cerro de los Bafios, near Mexico (Bourgeau, 47). Hort. Kew. 
Pfeiffer (Enum. Diag. Cact. p. 31) makes the following varieties — 
Var. 6. prolifera. 
Var. y. andre, Otto. 
Mamiilaria inuncta, Hffsg. ? 
Var. 3. wendlandii. 
Mamillaria erinacea, Wendl. Cat. Hort. Herrenh. 1835. © 
Var. «. neglecta, Hort. Berol. 
Var. ¢. rubens. 
Mamillaria pyramidalis, Hort. Berol. 
204. Mamillaria robustispina, Schott, ex Engelm. Cact. U.S. et Mex. Bound. 
Surv. p. 11, t. 74. fig. 8. 
Norra Mexico, on grassy prairies on the south side of the Barbuquibari Mountains, 
Sonora (Schott). 
205. Mamillaria rosea, Scheidw. in Horticult. Belge, p. 118, t. 5, nec Galeotti. 
MEXICco. 
206. Mamillaria rufidula, Ehrb. in Otto & Dietr. Allg. Gartz. xvii. p. 295; 
Walp. Ann. ii. p. 677. 
MEXICO. 
207. Mamillaria rufocrocea, Salm Dyck, Cact. ed. 2, p. 102. 
Mexico, near Las Ajuntas, on the Montezuma river (Ehrenberg). 
908. Mamillaria ruschiana, Regel, Ind. Sem. Hort. Turic. 1850, Coll. p. 4, 
in adnot. 
MEXIco. 
209. Mamillaria rutila, Zucc., ex Pfeiff. Enum. p. 29. 
Mexico. 
BIOL. CENT.-AMER., Bot. Vol. 1, August 1880. 30 
