62 



THE CACTACEAE. 



n. 

 .i 



Mrs. Brandegee (Eryth 



same 



It is closely 

 plan, and its 



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seeds are quite different. 



K 



h 



K 



74 



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Figs. 74, 75. 76. — Opuntia cholla. X0.66. 



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itia versicolor Engelmann in Coulter, Contr. U. S. Nat. Herb. 3 : 4 



Opuntia arhorescens versicolor E. Dams, Monafeschr. Kakteenk. 14: 3. i904- 



1896. 



¥■_ 





I 



Busli or tree-like, 2 to 4 meters high, with a large, open top sometimes 5 meters broad; trunk 

 and larger stems woody throughout, except the younger branches; terminal joints 10 to 20 cm. 

 long, 2.5 cm. in diameter, variously colored, not strongly tuberculate when Uving; tubercles 1.5 

 cm. long; spines 5 to 11, 5 to 25 mm. long, dark colored, with close-fitting sheaths; glochids red- 



J 



dish brown; 



greenish 



ovary tuberculate, with large areoles bearing wool, glochids, and long deciduous bristles; fruit 

 persisting for months, sometimes for a year, 2.5 to 4 cm. long, at first somewhat tuberculate, becom- 

 ing pear-shaped or globose, sometimes proliferous; seeds white, 5 mm. broad. 



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Type locality: Tucson 



Distribution: Ar 



This soecies is common on the lower foothills and is only rarely found on the mesas 



V -q 



Mexico 



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almost entirely from 



V* 



name 



many 



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LI 



r -^j 

 n ■ I 



greater or less extent paralleled in that of the branches. The contrast in color shown by 



impression is that more 



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species exists. 



Named specimens of this species were distributed by the late Dr. C. G 



_ 1 



Club 



i88ij.but the species was not published until 1896. 



[lustrations: Ariz. Agr. Exp. Sta. Bull. 67 : pi. 6, f. i ; Bull. Torrey 

 4 to 8; Hornaday, Camp-fires on Desert and Lava, pi. facing p. 18, 116, 320; N. Mex 

 Exp. Sta. Bull. 60 : pi. 6, f . i ; Plant World ii^°: f. 8; Sargent, Man. Trees N. Amer. f 



Plate VII, figure 5, represents a fruiting joint; plate viii, figure 2, is from a p 

 e^raoh taken bv Dr. MacDoueral near the base of the Santa Catalina Mountains. Ari 



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plate IX, figures 2 to 5 

 zona, bv Kako Morita, s 



made at the Desert Laboratory, Tucson, Ari- 



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■■•■*v., ■■ ■ ■ ^' " 



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