134 UNIVERSITY OF MISSOURI STUDIES [282 



and Ward, and at Caribou (Rydberg). Common everywhere 

 above 9000 ft. (Ramaley). 



Wyoming to New Mexico and Arizona. 



501. C. incana (Gray) A. Nels. [C. cardiophylla Rydb. ; 

 C. infausta Greene]. Hoary bittercress. 



Along an alpine brook at edge of snow above Bloomerville, 

 9000-10000 ft. (Daniels, 323). 

 Colorado. 



502. C. vallicola Greene. Valley bittercress. 



Dripping rocks under an irrigation sluice, Boulder Cafion, 

 5500-5600 ft. (Daniels, 578). 

 Wyoming to Colorado. 



201. ARABIS L. Rock-cress. 



503. A. ovata (Pursh) Poir. Ovate-leaved rock-cress. 

 Common among rocks throughout the mountain region and 



the rougher mesas, 5700-10000 ft. (Daniels, 567). Also from 

 Eldora to Baltimore (Rydberg). 



New Brunswick to Alberta ; Georgia to California. 



504. A. philonipha A. Nelson. Snow-loving rock-cress. 

 Mountainsides at Ward, 9000-9500 ft. (Daniels, 954). 

 Montana to Washington ; Colorado to Utah. 



505. A. oxyphylla Greene. Sharp-leaved rock-cress. 

 Mesas and foothills; common, 5600-8000 ft. (Daniels, 199). 



University Hill near base of Flagstaff Hill (Cockerell). 

 Wyoming to Colorado and Utah. 



506. A. coimexa Greene. Related rock-cress. 



Ward 9200 ft. (Daniels, 207). Also from Eldora to Bal- 

 timore (Rydberg). 



Montana to Colorado and Utah. 



507. A. Fendleri (S. Wats.) Greene [A. Hoelhoellii Fcnd- 

 leri S. Wats.]. Fendler's rock-cress. 



High alpine slope near snow above Bloomerville, 9000-10000 

 ft. (Daniels, 318). 

 Colorado to New Mexico. 



