OPUNT1A. 



143 



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 

 two commonest species in that region. 



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



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

 River, Texas, by Dr. Rose in 1913. 



FIG. 181. Opuntia azurca. Zacatecas, Mexico. 



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 in 

 age pink throughout; filaments greenish or almost white; 

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

 ovoid, spineless, truncate, juicy, edible. 



Type locality: Northeastern Zacatecas, Mexico. 



Distribution: Zacatecas and probably Durango. 



Illustrations: Contr. U. S. Nat. Herb. 12: pi. 24; 

 also f. 33. 



Figure 181 is from a photograph by F. E. Lloyd 

 of the type plant; figure 182 represents joints of the 

 plant collected by Albert de Lautreppe near Zacatecas, 

 Mexico, in 1904. 



FIG. 182. 



Opuntia azurca 



Xo. 4 . 



