OPUNTIA. 



14.^ 



Type locality: Near Devil's River, Texas. 

 Distribution: Type locality and vicinity. 



This plant is abundant between Del Rio, Texas, and Devil's River, being one of the 

 commonest soecies in that rerion. 



Illustrations: Rep. Mo. Bot. Gard. 21: pi. 26, in part. 



Plate XXV, figure i, represents a flowering joint of the plant collected near Devil's 



r. Texas, bv Dr. Rose in loi^. 







Fig. 181. — Opuntia azurea, Zacatecas. Mexico. 



t I 



144. Opuntia azurea Rose, Contr. U. S. Nat. Herb. 12: 291. 



1909. 



Compact, upright, with a single trunk, or branching 

 from the base and more or less spreading; joints orbicular to 

 obovate, 10 to 15 cm. in diameter, pale bluish green, glau- 

 cous; areoles about 2 cm. apart, the lower ones spineless, 

 the upper ones with i to 3 rather stout spines; spines, at 

 least when old, almost black, unequal, the longer ones 2 to 3 

 cm. long, more or less reflexed; glochids numerous, brown; 

 petals 3 cm. long, deep yellow, with crimson claw, but m 

 age pink throughout; filaments greenish or almost white; 

 stigma-lobes pale green; fruit dull crimson, subglobose to 

 ovoid, spineless, truncate, juicy, edible. 



Mexico 



Distribution : 

 Illustrations: 



Zacatecas and probably Durango. 



S 



also f. 33. 



Figure 18 



from a photograph by F. E 



of the type plant; figure 182 represents joints of the 

 plant collected by Albert de Lautreppe near Zacatecas, 

 Mexico, in iooa. 



Fig. i8i. 



Opuntia azurea 

 X0.4. 



-t 



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