290 



Eutrema arenicola Richardson, Parrya arenicola J. Hooker, 

 Sisymbrium humifusum J. Vahl and Arabis humifusa Wats. 

 The geographical distribution is in Arctic America from 

 Alaska to Grinnell Land and Labrador, in West Greenland 

 from 61°— 70° N. Latitude. A variety with the lower leaves 



Fig. 1. 



A, c, d, Arabis arenicola (Richards.) Gelert. (Specimen from West 

 Greenland 61° 15' N. Lat. collected by Dr. L. K. Rosenvinge), a, b. Arabis 

 petrœa (L.) Link. 



and base of the stem pubescent, Y.pubescens Wats, is found 

 at York Factory, Hudson Bay. 



It is remarkable that the Arabis arenicola replaces the 

 Arabis petrœa in Greenland and America, and that these 

 two species mainly differ , as already J. Vahl has shown, in 

 the form of the seeds, which in the latter are large, winged 



