OPUNTIA. 



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. Gard. 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 azurea, 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 azurea 



X0.4. 



