180 UNIVERSITY OF MISSOURI STUDIES [328 



302. MERIOUXRaf. 



740. M. serrulata (Nutt.) Walp. [Oenothera serrulata Nutt.]. 

 TOOTH-LEAVED EVENING PRIMROSE. 



Common on the plains and foothills, 5100-8000 ft. (Daniels, 



38). 



MANITOBA to SASKATCHEWAN ; TEXAS to ARIZONA. 



303. GATTRA L. GAURA.* 



741. G. parviflora Dougl. SMALL-FLOWERED GAURA. 

 Frequent on the plains, mesas, and lower foothills, 5100-7000 



ft. (Daniels, 263). 



SOUTH DAKOTA to WASHINGTON; LOUISIANA to ARIZONA 

 and SONORA. 



742. G. coccinea Pursh. SCARLET GAURA. 



Abundant 0n the plains and mesas, and in meadows on 

 lower hillslopes, 5100-6300 ft. (Daniels, 12). 



MANITOBA to MONTANA ; TEXAS to ARIZONA and MEXICO. 



743. G. glabra Lehm. SMOOTH GAURA. 

 At Boulder (Rydberg). 



SOUTH DAKOTA to MONTANA; COLORADO to ARIZONA. 



304. CIRCAEA L. ENCHANTER'S NIGHTSHADE. 



744. C. alpina L. ALPINE ENCHANTER'S NIGHTSHADE. 

 Locally abundant along streams in shady canons, 5700-8000 



ft. (Daniels, 279). 

 LABRADOR to ALASKA ; GEORGIA to COLORADO : EUROPE : ASIA. 



*"Gaura and allied evening flowering plants have a special bee-visi- 

 or, Halictus galpinsiae Cockerell, which has been taken by my wife at 

 Boulder. It flies in the evening, at 7:30 p. m., when the other bees 

 have retired." Prof. T. D. A. Cockerell, in a letter to the author, Jan. 

 23, 1908. 



