Brassica arveusis, (L.) B. S. P. Wild Mustard. 

 Brassica sinapistrum, Bois. 



A troublesome weed in cultivated fields throughout 

 the state, but more abundant in the eastern part. It is 

 much more abundant and harder to eradicate in the bot- 

 tom lands. 



Sinapsis alba, L. White Mustard. 

 Brassica alba, Bois. 



A weed in cultivated and waste places throughout the 

 state. 



Roripa siiiiata, (Nutt.) A. S. Hitchcock. Spreading 

 Yellow-cress. 



Occasional in low places from the Missouri valley 

 eastward. 



Koripa palustris, (I,.) Bess. Marsh Water-cress. 

 Nasturtium palustris, DC. 



In low, wet places throughout the state. 



Roripa hispicla, (Desv.) Britton. Hispid Yellow-cress. 

 Nasturtium hispidium, DC. 



Occasional in low places from the Missouri valley 

 eastward. 



Roripa nasturtium, (L.) Rusby. Water-cress. 

 Nasturtium officinale, R. Br. 



Naturalized near Hot Springs in the Black Hills. 



Roripa armoracia, (L,.) A. S. Hitchcock's Horseradish. 

 Nasturtium armoracia, Fries. 



Sparingly introduced into the Sioux valley. 



Carclamine bulbosa, (Schreb.) B. S. P. Bulbous Cress. 

 Cardamine rhomboida, DC. 



In shallow water and low meadows in the Minnesota 

 and Sioux valleys. 



Carclamine rotimclifolia, Michx. American Water-cress. 

 In cold, springy bogs in the Minnesota region. 



