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 Canon, 



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. connexa 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. Hoelboellii Fend- 

 leri S. Wats.]. FENDLER'S ROCK-CRESS. 



High alpine slope near snow above Bloomerville, 9000-10000 

 ft. (Daniels, 318). 

 COLORADO to NEW MEXICO. 



