546 CACTACEA. 
63. Cereus scheerii, Salm Dyck, Cact. ed. 2, p. 190. 
Nort Mexico, Chihuahua (Potts). | | 
64, Cereus schottii, Engelm. Cact. U.S. & Mex. Bound. Surv. p. 44, t. 74. fig. 16. 
Norra Mexico, Sonora, towards Santa Magdalena (Schott). 
65. Cereus schrankii, Zuce. in Pfeiff. Enum. p. 122; Pfeiff. & Otto, Abbild. 
1. t. 27. 
Cereus formosus, Monv. Cat. 1834. 
SovrH Mexico, Zimapan, Sultepec (Karwinski). 
66. Cereus senilis, Salm Dyck in DC. Prodr. iii. p. 464. 
Pilocereus senilis, Lem. Cact. Gen. et Sp. Nov. Hort. Monv. p. 6; Salm Dyck, Cact. ed. 2, p. 186. 
Cactus senilis, Haw. in Phil. Mag. Ixiii. p. 41. . 
Cactus bradypus, Lehm. Ind. Sem. Hort. Hamb. 1826, p. 17; Act. Nov. Nat. Cur. xvi. pt. 1, t. 12. 
South Mexico, in the Barranca of Regla near San Sebastian, and in the great 
Barranca of the Rio Grande near Mestitlan (Ehrenberg); Guaremata. Hort. Kew. 
67. Cereus serpentinus, Lagasc. in Ann. Sc. Nat. 1801, p. 261; Bot. Mag. 
t. 3566. 
SoutH Mexico, used for forming hedges about Regla (Ehrenberg). Hort. Kew. 
67*. Cereus (Echinocereus) similis, Regel & Klein, Ind. Sem. Hort. Petrop. 
1860, p. 29. 
Mexico (Karwinski). 
68. Cereus spachianus, Lem. Hort. Univ. i. p- 225. 
Mexico. Hort. Kew. 
69. Cereus speciosissimus, Desf. in Mém. Mus. iii. p. 190, t. 9; Bot. Reg. t. 486. 
Cereus speciosissimus (. lateritius, Bot. Reg. t. 1596. . 
Mexico; GuatemaLa. Hort. Kew. 
70. Cereus spinulosus, DC. Rev. Cact. p. 117. 
Mexico (Coulter). 
71. Cereus stellatus, Pfeiff. in Otto & Dietr. Allg. Gartz. 1836, p. 258. 
Mexico. 
72. Cereus stramineus, Engelm. Cact. U. S. & Mex. Bound. Surv. p. 35, t. 46, 
47, et 48. fig. 1. 
Texas; New Muxtco. —Nortu Mexico, El Paso to the Gila river (Bigelow &e). Hort. 
Kew. : 
73. Cereus (Echinocereus) subinermis, Salm Dyck, ex Scheer in Seem. Bot. 
Voy. ‘ Herald,’ p. 291. 
Nort Mexico, Chihuahua (Pots). 
74. Cereus superbus, Ehrb. in Bot. Zeit. iv. p. 324. 
MEXxivo. 
