506 



Cruciferae 



Arabis 



50 



Map 1041 



Arabis viridls var. . Deamii Hopkins 



5o 



Map 1042 



Arabis patens Sull'v. 



6 55 



Map 1043 



Arabis dentata T. & G. 



This species is variable in its pubescence which is sometimes restricted 

 to the lower part of the plant. Its pubescence, strict habit, and its habit 

 of sending up several erect branches from the base usually identify it. 



N. B. to Alaska, southw. to Ga., Mo., Ariz., and Calif. 



2a. Arabis pycnocarpa var. adpressipilis Hopkins. (Rhodora 39: 117- 

 118. 1937.) Map 1040. This variety is infrequent and has the habitat of 

 the species. 



Ont. to Minn., southw. to Va., Mo. and Okla. 



3. Arabis viridis Harger var. Deamii Hopkins. (Rhodora 39: 157-158. 

 1937.) Map 1041. This species is probably not very rare in northern 

 Indiana since I have it from three counties. My specimens are from dry 

 sandy and gravelly slopes. 



Ind., Wis., and Mo. 



4. Arabis patens Sulliv. Spreading Rockcress. Map 1042. I have 

 found this species in two places only. In Bartholomew County it was 

 growing on top of a limestone rock along Clifty Creek north of Hartsville 

 and in Harrison County there is a colony of it in the talus of the ledges of 

 the cliff along a side road along Blue River about a half mile north of White 

 Cloud. It is very local. It has, however, been reported from Clark, Decatur, 

 Jefferson, and Tippecanoe Counties. 



Pa. to Ind., southw. to Tenn. 



5. Arabis dentata T. & G. Toothed Rockcress. Map 1043. Infrequent 

 to rare throughout the state or absent from some counties. Locally it may 

 be rather frequent but I have never found it so. It is usually found in 

 moist, sandy soil of wooded, alluvial bottoms, in the talus of cliffs, and 

 rarely in dry soil on slopes. It is restricted almost entirely to the proximity 

 of streams and is more frequent along our major streams. 



Western N. Y. to Minn., southw. to Va., Tenn., Mo., and Okla. 



