CACTACEZ. 547 
75. Cereus thurberi, Engelm. in Sillim. Journ. 1854, et Cact. U.S. & Mex. 
Bound. Surv. p. 44, t. 74. fig. 15. 
Norra Mexico, Sonora, west of the Sierra Madre (Thurber), more common south- 
ward (Schott). 
76. Cereus triangularis, Haw. Synop. p. 180; Bot. Reg. t. 1807; Bot. Mag. 
t. 1834. 
West Inpizs.—Souta Mexico, region of Orizaba (Bourgeau, 2488). Hort. Kew. 
77. Cereus tuberosus, Poselger in Engelm. Synop. p. 30. 
NortH MzExico. 
78. Cereus variabilis, Pfeiff. Enum. p. 105; Pfeiff. & Otto, Abbild. ii. t. 15. 
Cereus pitajaya, DC. Prodr. iii. p. 466; Bot. Mag. t. 4084. 
Cereus undulosus, DC. Rev. Cact. p. 46. 
Trxas.—Norta Mexico, on the Lower Rio Grande (Engelmann); Panama, common 
on the sea-shore (Seemann). Hort. Kew. 
79. Cereus virens, DC. Rev. Cact. p. 116. 
Cereus tilophorus, Pfeiff., ex Labour. Cact. p. 359. 
Cereus exerens, Link, ex Pfeiff. Enum. p. 99. 
Mexico; BRAZIL. 
Scheer, in Seemann’s ‘ Botany of the Voyage of the “Herald,”’ p. 292, describes 
six unnamed forms under Echinocereus, collected by Potts in Chihuahua, North Mexico, 
nos. 273-278 inclusive. 
7. PHYLLOCACTUS. 
Phyllocactus, Link, Handb. iii. p. 11; Benth. et Hook. Gen. Plant. i. p. 849. 
About fifteen species, dispersed from Mexico to Brazil. 
1. Phyllocactus ackermanni, Salm Dyck, Cact. ed. 2, p. 55. 
Epiphyllum ackermanni, Haw. in Phil. Mag. 1829 ; Bot. Reg. t. 1331. 
Cereus ackermanni, Pfeiff. Enum. p. 123 ; Bot. Mag. t. 3598. 
Mexico, “only seen in cultivation” (Ehrenberg), ?Izhuatlancillo (Bourgeau, 2523). 
Hort. Kew. 
2. Phyllocactus anguliger, Lem. Jard. Fl. 1851; Bot. Mag. t. 5100; Lindley 
& Paxton, Fl. Gard. t. 34. 
Sour Mexico, near Matanejo. Hort. Kew. 
3. Phyllocactus biformis, Lab. Monogr. Cact. p. 418; Bot. Mag. t. 6156. 
Disocactus biformis, Lindl. Bot. Reg. 1845, t. 9. 
Disisocactus biformis, Salm Dyck, Cact. ed. 2, p.57. 
Honpuras (Skinner). 
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