542 . . CACTACEA. 
18. Cereus conicus, Hort. Berol., ex Pfeiff. Enum. p. 97. 
MEXxIco. . 
19. Cereus ctenoides, Engelm. Cact. U.S. & Mex. Bound. Surv. p. 31, t. 42. 
Norra Mexico, Eagle Pass to Santa Rosa Coahuila (Bigelow). 
20. Cereus dichroacanthus, Mart., ex Pfeiff. Enum. p. 76. 
Mexico. | 
21. Cereus dubius, Engelm. Cact. U.S. & Mex. Bound. Surv. p. 36, t. 50. 
Texas; New Mexico.—Norta Mexico, valley of the Rio Grande (Wright, Bigelow, 
Parry). 
22. Cereus dyckii, Mart. in Otto & Dietr. Allg. Gartz. 1836, p. 258; Pfeiff. 
Enum. p 87. 
South Mexico, near Zimapan. Hort. Kew. 
23. Cereus ehrenbergii, Pfeiff. in Otto & Dietr. Allg. Gartz. 1840, p. 282; 
Labour. Cact. p. 313. 
MEXxIco. | 
24. Cereus enneacanthus, Engelm. Synops. Cact. U.S. &c. p. 26, et Cact. U.S. 
& Mex. Bound. Surv. p. 34, t. 48. figg. 2-4, et t. 49. 
New Mexico—and far into Mxxico proper (ex Engelmann). 
25. Cereus emoryi, Engelm. in Sill. Journ. et Cact. U.S. & Mex. Bound. Surv. 
p. 40, t. 60. figg. 1-4. 
Catirornia.—Norta Mexico, “not north of the boundary line” (Le Conte). 
26. Cereus engelmanni, Parry in Sill. Journ. 1852; Engelm. Cact. U.S. & 
Mex. Bound. Surv. p. 36, t. 57. 
CaLiForNiA.—NortH Mexico, common in the Gila valley (Schott). Hort. Kew. 
27. Cereus erectus, Karw. in Pfeiff. Enum. p. 95. 
Souta Mexico, near Zimapan (Karwinski). | 
28, Cereus euphorbioides, Haw. Suppl. p. 75; Pfeiff. Enum. p. 92. 
Mexico &c. Hort. Kew. 
29. Cereus fendleri, Engelm. Pl. Fendl. et Cact. U.S. & Mex. Bound. Surv. 
p. 33. 
Texas; New Mexico.—Norra Mexico, El Paso to the Gila river &c. (Bigelow &c.). 
80. Cereus flagelliformis, Haw. Syn. Pl. p. 185; Bot. Mag. t. 17. 
Cactus flagelliformis, Linn. DC. Pl. Gras. t. 127. 
Aporocactus flagelliformis, Lem. 
Widely dispersed in Tropica, AMERICA, and extending to—Mexico ? 
“ Frequently seen as an ornamental plant. At Guachinango and San Bartolo, on 
