Sophia Hartweji'iaiia, (Fourn.) Greene. Hastings' Tansy 

 Mustard. 

 Sisymbriiun Hartivegianuin^ Fourn. 



Common in dry soil in the Sioux valley. 



Arabis liirsuta, (L.) Scop. Hairy Rock-cress. 



On prairies in the Minnesota, Sioux and James val- 

 leys and in the Black Hills. 



Arabis Canadensis, L. Sickle-pod. 



In open woods in the Minnesota valley. 



Arabis brachycarpa, (T. & G.) Britton. Purple Rock- 

 cress. 

 In woods in the Minnesota valley. 



Arabis g'labra, (L.) Bernh. Tower Mustard. 



Arabis perfoliata^ L. 



Occasional in the Minnesota and Sioux valleys and in 

 the Black Hills. 



Arabis Horboellii, Hormen. Horboell's Rock-cress. 

 In the Black Hills. 



Erysiuiuin cheiraiithoides, (Iv.) Treachle Mustard. 



In thickets in the vicinity of streams in the Minnesota 

 and Sioux valleys and in the Black Hills. 



Erysimum iiuMnispicuum, (S. Wats.) MacM. Small 

 Erysimum. 



In the Sioux valley and the Black Hills; not common. 



Erysimum Syrtiooluin, Sheldon. Sand Erysimum. 

 In the Minnesota region, near Bigstone lake. 



Erysimum asperum, DC. Western Wall-flower. 

 On dry soil from the Missouri valley westward. 



Matthiola fenestralis, Stock. 



There is a single specimen in the herbarium from 

 Spring lake, Walworth county, with no note as to the 

 extent to which it has become naturalized. 



