554: CACTACEZ. 
55. Opuntia tenuispina, Engelm. Cact. U.S. & Mex. Bound. Surv. p. 50, t. 15. 
fig. 14. 
Nortu Mexico, along the Rio Grande (Wright). | 
56. Opuntia tessellata, Engelm. in Pacif. Railr. Rep., Cact. P 02, t. 21. figg. 
1-7, et Cact. U.S. & Mex. Bound. Surv. p. 60. 
Opuntia ramosissima, Engelm. in Sill. Journ. 1852. 
Cattrornta.—Nortu Mexico, Sierra Madre, south of the Gila (Schott). 
57. Opuntia thurberi, Engelm. Cact. U.S. & Mex. Bound. Surv. p. 59. 
Nort Mexico, near Bacuachi, Sonora (Thurber). 
58. Opuntia tomentosa, Salm Dyck, Obs. Bot. p. 8; Pfeiff. Enum. p. 160. 
Cactus tomentosus, Link, Enum. ii. p. 24. 
Mexico. Hort. Kew. 
59. Opuntia tuna, Mill. Dict. ed. 8; Pfeiff. Enum. P. 161. 
Opuntia coccinellifera, DC. Pl. Grass. t. 137. 
Cactus bonplandii, H. B. K. Nov. Gen. et Sp. vi. p. 69. 
Merxico.—Cotomsia; Perv. 
60. Opuntia tunicata, Lehm. in. Act. Nov. Nat. Cur. xvi. pt. 1, p. 319; 
Pfeiff. Enum. p. 170. 
Opuntia furiosa, Wendl. Cat. Hort. Herrenh. 1835. 
NortH Mexico, Chihuahua (Potts), Sierra Babuquibari, Sonora; Soura MExIco, 
Pefion de los Bafios, valley of Mexico (Bourgeau, 304). Hort. Kew. 
Ehrenberg distinguishes two species, and states that they cover large expanses of the 
uplands of Mexico. 
61, Opuntia vulgaris, Mill. Dict. ed. 8; Pfeiff. Enum. p. 149. 
Cactus opuntia, Linn. Sp. Pl. p. 669; Bot. Mag. t. 2398. 
Mexico. Hort. Kew. 
62. Opuntia wrightii, Engelm. Cact. U.S. et Mex. Bound. Surv. p. 59. 
Texas.—Norta Mexico, southward in Mexico (Gregg), mountains of Sonora (Wright). 
63. Opuntia whipplei, Engelm. et Bigel. in Pacif. Railr. Rep. Cact. p. 50, t. 17. 
figg. 1-6, t. 18. fig. 4; et Engelm. Cact. U.S. & Mex. Bound. Surv. p. 7. 
Var. Spinosior, Engelm. loc. cit. 
Norta Mexico, from the Gila south to the Santa Cruz river and Tucson and further 
east (Schott). 
64. Opuntia vaginata, Engelm. & Bigel. Pacif. Railr. Rep. Cact. p. 52, t. 20. 
fig. 1, t. 24. figg. 18-15. 
New Mexico.—Norru Mexico, about San Luis Potosi ( Gregg). 
