Sophia Hartwegiana, (Fourn.) Greene. Hastings' Tansy 

 Mustard. 

 Sisymbrium Hartwegianum, Fourn. 



Common in dry soil in the Sioux valley. 



Arabis hirsuta, (I/.) Scop. Hairy Rock-cress. 



On prairies in the Minnesota, Sioux and James val- 

 leys and in the Black Hills. 



Arabis Cauacleiisis, 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 glabra, (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. 



Erysimum cheiraiithoides, (I,.) Treachle Mustard. 



In thickets in the vicinity of streams in the Minnesota 

 and Sioux valleys and in the Black Hills. 



Erysmium iiicoiispicuum, (S. Wats.) MacM. Small 

 Erysimum. 



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



Erysimum Syrticolum, 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 feiiestralis, 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. 



