CACTACEA. 543 
the Rio Grande, this or a very similar species grows on trees and cliffs.” (Ehrenberg). 
Hort. Kew. 
31. Cereus flagriformis, Zucc., ex Pfeiff. Enum. p. 111; Pfeiff. & Otto, Abbild. 
1. t. 12. 
Mexico, near San José del Oro (Karwinski). 
32. Cereus flavescens, Otto in Pfeiff. Enum. p. 79 ; Salm Dyck, Cact. ed. 2, p. 43. 
Mexico? 
33. Oereus gemmatus, Zucc., ex Pfeiff. Enum. p. 96. 
Sour Mexico, near San José del Oro, on rocks in the cold regions of the valley of 
Mexico, between the capital and Pachuca (Ehrenberg). Hort. Kew. 
34, Cereus geometrizans, Mart., ex Pfeiff. Enum. p. 90. 
South Muxico, temperate regions near Zimapan, Mestitlan, Ismiquilpan, &c. (Lhren- 
berg). Hort. Kew. 
g. pugioniferus, Salm Dyck, Cact. ed. 2, p. 48. 
Cereus pugioniferus, Lem. Cact. aliq. Nov. Hort. Monv. p. 80. 
Soura Mexico, Mestitlan, Ismiquilpan, Zimapan, &c. (ex Ehrenberg). 
35. Cereus giganteus, Engelm. in Emory’s Rep. 1848, et Cact. U.S. & Mex. 
Bound. Surv. p. 42, t. 61, 62, et tab. front. 
New Mexico.—Norri Mexico, in Sonora to lat. 30° (Thurber, Schott), and along the 
Gila valley (Emory, Parry), also south to lat. 98°, near Guaymas (ex Englemann & 
Bigelow). Hort. Kew. 
36. Cereus gladiator, Dietr. in Otto & Dietr. Allg. Gartz. vi. p. 34 ; Walp. Rep. 
ii. p. 340. 
Cereus pugioniferus, Lem. Cact. alig. Nov. Hort. Monv. p. 30. 
Sourn Mexico, Mestitlan, Ismiquilpan, Zimapan, and many other places (Ehrenberg). 
Salm Dyck (Cact. ed. 2, p. 48) makes C. pugioniferus a variety of C. geometrizans. 
37. Cereus greggil, Engelm. in Wisliz. Rep. etCact.U.S.& Mex. Bound. Surv. p. 40. 
x. cismontanus, Engelm. loc. cit. t. 63, 64. 
B. transmontanus, Engelm. loc. cit. t. 65. 
Texas.—Norra Mexico, Sonora (Schott, Thurber), Chihuahua (Gregg). Hort. Kew. 
38. Cereus leeanus, Hook. Bot. Mag. t. 4417. 
MExIco. 
39, Cereus leptophis, DC. Rev. Cact. p. 117, et Mém. t. 12. 
Mexico, without locality (Coulter). Hort. Kew. 
40. Cereus longisetus, Engelm. Cact. U.S. et Mex. Bound. Surv. p. 32, t. 45, et 
Synop. Cact. U. 8. &c. p. 24. 
Norra Mexico, Santa Rosa, Coahuila (Bigelow). 
