BRITTON AND ROSE] OPUNTIOIDKAE OF NORTH AMERICA 509 



OPUNTIA SERPENTINA Engelm. 



Opuntia serpentina Engelm. Am. Journ. Sci. II. 14: 338. 1852. 



Cereus calif ornicns Nutt. ; Torr. & Gr. Fl. N. Am. 1 : 555. 1840, not 



» Opuntia calif ornica Engelm. 



Type locality : Near the seacoast about San Diego, California. 

 Distribution : Southern California and Lower California. 



OPUNTIA ECHINOCARPA Engelm. & Bigel. 

 Opuntia echinocarpa Engelm. & Bigel. Proc. Am. Acad. 3: 305. 1856. 



Type locality: In the Colorado Valley near the mouth of Bill 

 Williams River. 



Distribution : Utah, Arizona, and California. 



Illustrations: Pac. R. Rep. 4: pi. 18. figs. 5-10; pi. 24. fig. 8. 



Professor Coulter recognized the following subspecies : 



OPUNTIA ECHINOCARPA MAJOR Engelm. 



Opuntia echinocarpa major Engelm. Proc. Am. Acad. 3: 305. 1856. 

 Opuntia echinocarpa robustior Coult. Contr. Nat. Herb. 3: 446. 1896. 



Type locality : In Sonora. 



Distribution : Arizona, California, and northern Sonora. 



OPUNTIA ECHINOCARPA PARKERI Coult. 



Opuntia echinocarpa parkeri Coult. Contr. Nat. Herb. 3:446. 1896. 



Type locality: In San Diego County, California. 

 Distribution : Southern California. 



OPUNTIA ECHINOCARPA NUDA Coult. 



Opuntia echinocarpa nuda Coult. Contr. Nat. Herb. 3: 446. 1896. 



Type locality : San Gregorio, Lower California. 

 Distribution : Lower California. 



OPUNTIA STAPELIAE DC. 



Opuntia stapcliae DC. Mem. Mus. Paris 17: 117. 1828. 



Type locality : In Mexico. 

 Distribution : Mexico. 



OPUNTIA DAVISII Engelm. & Bigel. 



Opuntia davisii Engelm. & BiGEL. Proc. Am. Acad. 3:305. 1856. 



Type locality : Upper Canadian, about Tucumcari Hills, near the 

 Llano Estacado. 



Distribution : Texas. 



Illustrations: Pac. R. Rep. 4: pi. 16; Bot. Mag. 108: pi. 6652. 



