BRITTON AND ROSE] OPUNTIOIDEAE OP NORTH AMERICA 533 



somewhat angled, 2 to several from each areole, very unequal, the 

 longer ones 6 cm. long, brownish or yellowish brown throughout; 

 glochides numerous, brown ; flowers large, yellow ; ovary 4 to 5 cm. 

 long, with few areoles and nearly or quite spineless ; fruit more or 

 less tuberculate, red; umbilicus broad and somewhat depressed; 

 seeds 5 mm. broad. 



Type in U. S. National Herbarium, no. 40,809, collected at San 

 Bernardino, California, by G. R. Vasey in 1891 ; also collected by 

 Parish and by Coville in the same region. We are not certain 

 whether all the so-called 0. lindhcimcri from southeastern California 

 belongs here or not, but if so, then here should be referred Engel- 

 mann's Californian material referred to 0. angustata. 



Series XEROCARPEAE 



Spreading flat- jointed plants with dry or nearly dry fruits. 



OPUNTIA SPHAEROCARPA Engelm. & Bigel. 



Opuntia sphaerocarpa Engelm. & BiGEL. Proc. Am. Acad. 3: 300. 1856. 



Type locality : Mountains near Albuquerque, New Mexico. 

 Distribution : Known only from type locality. 

 Illustrations: Pac. R. Rep. 4: pi. 13. figs. 6, 7;- pi. 24. fig. 3. 



OPUNTIA SPHAEROCARPA UTAHENSIS Engelm. 



Opuntia sphaerocarpa utahensis Engelm. Trans. St. Louis Acad. 2: 199. 

 1863. 



Type locality : Utah Basin. 



Distribution: Known only from type locality. 



OPUNTIA POLYACANTHA Haw. 



Cactus ferox Nutt. Gen. 1 : 296. 1818, not Willd. 1813. 



Opuntia polyacantha Haw. Syn. PI. Succ. Suppl. 82. 1819. 



Opuntia media Haw. loc. cit. 1819. 



Opuntia niissouriensis DC. Prod. 3:472. 1828. 



Opuntia splendens Pfeiff. Enum. Cact. 159. 1837. 



Type locality : Arid situations on the plains of the Missouri. 



Distribution : Athabasca to Washington, Nebraska, and New 

 Mexico. 



Illustrations: Pac. R. Rep. 4: pi. 14. figs. 1—3; Bot. Mag. pi. 7046; 

 111. Fl. fig. 2331. 



The following subspecies recognized by Dr. Coulter have not been 

 sufficiently studied by us to enable us to express opinions concerning 

 their relationships. 



