323] FLORA OF BOULDER, COLORADO 1 75 



292. OPTTNTIA Mill. Prickly pear. 



715. 0. mesacantha Raf. [0. humifusus Raf. ; O. Rafinesquii 

 Engelm.]. Western prickly pear. 



Abundant on the plains, mesas and foothills, the commonest 

 cactus about Boulder, 5100-7000 ft. (Daniels, 93). 



Wisconsin and Minnesota to Colorado; Kentucky and 

 Texas to Arizona. 



716. 0. polyacantha Haw. Many-spined prickly pear. 



On the mesas and foothills, apparently ascending higher than 

 the preceding species, 5600-8000 ft. (Daniels, 690). 



North Dakota to British Columbia; Oklahoma to New 

 Mexico and Oregon. 



717. 0. rhodantha K. Sch. Red-flowered prickly pear. 

 On the foothills near the juncture of Sunset and Boulder 



Canons, 6500 ft. (Daniels). 

 Nebraska to Colorado. 



718. 0. Greenei Englm.^ in Coult. Cont. U. S. Nat. Herb. 3. 

 431, [^0. mesacantha Greenii (Engelm.). Coult.]. Greene's 



PRICKLY pear. 



Vicinity of Boulder (Andrews). 

 Colorado. 



719. 0. fragilis (Nutt.) Haw. Brittle prickly pear. 

 Common on the plains, mesas, and lower foothills, 5100-6500 



ft. (Daniels, 817). Not seen in flower. 



Wisconsin to British Columbia; Kansas to New Mex- 

 ico and Utah. 



Order 31. THYMELIALES. 

 Family 76. ELAEAGNACEAE Lindl. Silverberry family. 



293. lEPARGYUAEA Raf. Buffalo berry. 



720. L. Canadensis (L.) Greene [Shepherdia Canadensis (L.) 

 Nutt.]. Canadian buffalo berry. 



Valleys in the foothills west of Bear Mountain and South 

 Boulder Peaks, 7000 ft. (Daniels, 445). Also from Eldora to 



^ 



