BRITTON AND ROSE] OPUNTIOIDEAE OE NORTH AMERICA 535 



OPUNTIA TRICOPHORA (Engelm.) Britton & Rose 



Opuntia missouriensis tricophora Engelm. Proc. Am. Acad. 3:300. 1856. 

 Opnntia polyacantha tricophora CoulT. Contr. Nat. Herb. 3^437- 1896. 



Type locality: Mountains near Albuquerque, New Mexico. 

 Distribution : New Mexico and Texas. 

 Illustrations: Pac. R. Rep. 4: pi. 15, figs. 1-4; pi. 23. fig. 19. 

 This species is certainly distinct from O. polyacantha. It probably 

 does not belong to this series. 



OPUNTIA RHODANTHA Schum. 



Opnntia rhodantha Schum. Gesamtb. Kakteen 735. 1899. 



Type locality : Colorado, at 2,000 to 2,300 meters. 

 Distribution : Colorado. 



OPUNTIA XANTHOSTEMMA Schum. 



Opuntia xanthostemma Schum. Gesamtb. Kakteen 735. 1899. 



Type locality : Mesa Grande, Colorado, 2,000 meters. 

 Distribution : Colorado. 



OPUNTIA HYSTRICINA Engelm. & Bigel. 

 Opuntia hystricina Engelm. & BiGEE. Proc. Am. Acad. 3:299. 1856. 



Type locality : Colorado Chiquito and on San Francisco Mountains. 

 Distribution : New Mexico, Arizona, Nevada, and California. 

 Illustration: Pac. R. Rep. 4: pi. 15. figs. 5-7; pi. 23. fig. 75. 



Series TUMIDAE 

 Low turgid- jointed plants with dry or nearly dry fruits. 



OPUNTIA RUTILA Nutt. 



Opuntia rutila Nutt. ; Torr. & Gr. Fl. N. Am. 1 : 555. 1840. 

 Opuntia erinacea Engelm. Proc. Am. Acad. 3:301. 1856. 



Type locality: Arid clay hills in the Rocky Mountain range, near 

 the Colorado of the West, about latitude 42 °. 



Distribution : Wyoming to Arizona and California. 



Illustrations: Pac. R. Rep. 4: pi. 13. figs, 8-1 1; pi. 24. fig. 4; 

 Monatsschr. Kakteenk. 14: 105. 



The identity of O. rutila Nutt. with O. erinacea Engelm. was 

 indicated by Dr. Engelmann in the Report of Simpson's Expedition, 

 page 442; Nuttall's type came from southwestern Wyoming and 



