CACTACER. 593 
9921. Mamillaria seidelii, Tersch. Suppl. p. 1; Walp. Rep. ii. p. 301. 
Mexico. 
2992. Mamillaria seitziana, Mart. in Pfeiff. Enum. p. 18; Pfeiffer et Otto, 
Abbild. i. t. 8. | 
Sourn Mexico, Oaxaca (Ehrenberg), Ismiquilpan, above 8779 feet (Karwinski). 
993. Mamillaria sempervivi, DC. Rev. Cact. p. 114; Mém. p. 13, t. 8. 
Mamillaria caput-meduse, Otto in Pfeiff. Enum. p. 22; Labour. Cact. p. 90. 
Mamillaria diacantha, Lem. Cact. aliq. Nov. p. 2, ex Labour. Cact. p. 90. 
SoutH Mxxtco, without locality (Coulter), in meadows and thickets near Zimapan, at 
5000 to 5500 feet (Ehrenberg). 
9924. Mamillaria senilis, Lodd., ex Scheer in Seem. Bot. Voy. ‘ Herald,’ p. 286. 
Norra Mexico, on the tops of mountains near Chihuahua (Potts), Sierra Madre, on 
rocks (Seemann). Hort. Kew. 
095. Mamillaria setosa, Pfeiff. in Otto & Dietr. Allg. Gartz. 1843, p. 379, et 
Enum. p. 30. 
Mexico, Barranca de las Majadas (Ehrenberg). 
995*. Mamillaria severini, Regel et Klein, Ind. Sem. Hort. Petrop. 1860, p. 46. 
Mexico (Karwinsk7). : 
096. Mamillaria simplex, Haw. Synop. p. 177; DC. Mém. Cact. t. 7. 
Mexico (Coulter). 
99¢*. Mamillaria sororia, Meinsh. in Koch’s Wochenschrift, i. p. 28. 
Sovrn Mexico, Santa Barbara etc. (Karwinski). 
227. Mamillaria speciosa, Vriese in Tijdschrift Nat. Gesch. vi. p. 52. 
Mexico. 
998. Mamillaria spectabilis, Miihlpf. in Otto & Dietr. Allg. Gartz. xili. p. 346 ; 
Walp. Rep. v. p. 810. 
Sourn Mexico, Real del Monte (ex Mihlenpfordt). 
229. Mamillaria sphacelata, Mart. in Act. Nov. Nat. Cur. xvi. pt. 1, p. 339, 
t. 25. fig. 1. 
Sourn Mexico, Zimapan (Ehrenberg). Hort. Kew. | 
530. Mamillaria spherotricha, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. 
p. 33; Labour. Cact. p. 65. 
Mamillaria candida, Scheidw. in Bull. Acad. Brux. v. p. 496, ex Salm Dyck, Cact. ed. 2, p. 8. 
Norra Mexico, San Luis Potosi (Galeotti). 
931. Mamillaria spherica, Dietrich, ex Engelm. Cact. U.S. et Mex. Bound. 
Surv. p. 9. 
Taxas.—NortH Muxico, valley of the Rio Grande (Schott). 
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