526 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



Distribution : West Indies and tropical America. Naturalized in 

 the Mediterranean region. 



Illustrations : Mem. Acad. Neap. 6 : pi. I, 2; W. Watson, Cactus 

 Cult. fig. 80; Monatsschr. Kakteenk. 15: 151. 



OPUNTIA LAEVIS Coult. 



Opuntia laevis Coult. Contr. Nat. Herb. 3: 419. 1896. 



Type locality: Arizona. 

 Distribution: Arizona. 



Referred by Professor Schumann to O. inermis, but not at all like 

 that species. 



OPUNTIA LARREYI Weber 



Opuntia larreyi Weber; Coult. Contr. Nat. Herb. 3:423. 1896. 



Type locality : Queretaro, Mexico. 



Distribution : Mexico. 



Illustration: Bull. N. Mex. Coll. Agr. 64: pi. 1. 



Series SETISPINAE 



Characterized by the low habit, slender, delicate spines, and small 

 joints. 



OPUNTIA FILIPENDULA Engelm. 



Opuntia Mipendula Engelm. Proc. Am. Acad. 3:294. 1856. 



Type locality: Alluvial bottoms of the Rio Grande near El Paso. 

 Distribution : Texas, New Mexico, Chihuahua. 

 Illustrations : Cact. Mex. Bound, pi. 68; W. Watson, Cactus Cult. 

 fig. 81; Forst. Handb. Cact. ed. 2. fig. 131. 



OPUNTIA SETISPINA Engelm. 



Opuntia setispina Engelm. ; Salm-Dyck, Cact. Hort. Dyck. 239. 1850. 



Type locality : Pine woods in the mountains west of Chihuahua 

 (fide Engelm. Proc. Am. Acad. 3: 294). 

 Distribution : Known only from the type locality. 



OPUNTIA TENUISPINA Engelm. 



Opuntia tenuispina Engelm. Proc. Am. Acad. 3:294. 1856. 



Type locality : Sand Hills near El Paso, Texas. 

 Distribution: Type locality and vicinity. 

 Illustration : Cact. Mex. Bound, pi. 75. fig. 14. 



