323] FLORA OF BOULDER, COLORADO I75 



292. OPTJNTIA Mill. Prickly pear. 



715. 0. mesacantha Raf. [O. humifiisus Raf. ; 0. 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. polyacantlia Haw. Many-spined prickly pear. 



On the mesas and foothills, apparently ascending higher than 

 the preceding species, 5600-8000 ft. (Daniels, 6go). 



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, [C 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. LEPARGYKAEA 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 



