1 14 UNIVERSITY OF MISSOURI STUDIES [262 



147. CLAYTONIA L. Spring beauty. 



386. C. rosea Rydb. Rosy spring beauty. 

 Common at Boulder (Cockerell). 



Saskatchewan to British Columbia; Colorado to Cali- 

 fornia. 



387. C. megarrhiza Parry. Large-rooted spring beauty. 

 Arapahoe Peak, towards summit, 12000-13500 ft. (Daniels, 



889, collected by Mrs. T. D. A. Cockerell). 

 Montana and Colorado to Utah. 



148. CE.UNOCALLIS Rydb. Water spring beauty. 



388. C. Chamissoi (Ledeb.) Cockerell. Nov. comb. [Claytonia 

 Chamissonis Esch.]. Chamisso's water spring beauty. 



Along ditches in the plains, and in deep caiions in the foot- 

 hills and mountains ; along streams at Ward and Bloomerville ; 

 in subalpine bogs at Eldora ; and in wet tundras on Arapahoe 

 Peak, 5100-1 1000 ft. (Daniels, 239). Arapahoe Pass (Ryd- 

 berg). 



Minnesota to British Columbia; New Mexico to Cali- 

 fornia. 



149. OREOBROMA Howell. Bitter root. 



389. 0. pygmaea (Gray) Howell. [Calandrinia pygmaea 

 Gray; Lewisia pygmaea (Gray) Robinson]. Pygmy bit- 

 ter root. 



Arapahoe Peak, 12000 ft. (Rydberg). Redrock lake, loioo 

 ft. (Ram.aley & Robbins). 

 Montana and Colorado to California. 



150. PORTTJIACA L. Purslane. Pussley. 



390. P. oleracea L. Common purslane. 



Campus of the University of Colorado at Boulder (Cock- 

 erell). 



Tropical America, now cosmopolitan. 



391. P. retusa Engelm. Retuse-leaved purslane. 



Along the railroad in Sunset Cafion, 5700-7700 ft. (Daniels, 

 722). 



Arkansas to Nevada; Texas to New Mexico. 



