1907] 
Check List of the Flora of Milwaukee County. 
197 
CRUCIFER^. 
Lepidium ruderale L. Eoadside Pepper-grass. 
Waste-places in the city. 
L. virginicum L. Wild Pepper-grass. 
A weed along- roads. 
L. apetalum Willd. Apetalous Pepper-grass. 
Waste-places and roadsides, Greenfield. Locally abundant. 
Thlaspi arvense L. Penny-cress. 
Menomonee Valley. 
Sisymbrium officinale (L.) Scop. var. leiocarpum DC. Sisymhrium 
officinale (L.) Scop. Hedge Mustard. Common. 
S. altissimum L. Tall Sisymbrium. 
Common. 
Cakile edentula (Bigel.) Hook. Sea Rocket. 
Common in sand along lake shore. 
Brassica nigra (L.) Koch. Black Mustard. 
Common. 
B. juncea (L.) Cosson. Indian Mustard. 
Common. 
B. arvensis (L.) Kuntze. Charlock. 
Common. 
B. campestris L. Turnip. 
Occasionally escaped from cultivation. 
Diplotaxis bracteata Gren. & Godr. 
Menomonee Valley. One locality. 
Raphanus sativus (L.) Garden Eadish. 
Occasionally escaped from cultivation. 
Roripa palustris (L.) Bess. Yellow Water-cress. 
Xot common. 
R. Nasturtium (L.) Busby. Water-cress. 
Common, 
R. Armoracia (L,) A. S. Hitchcock, Horse-radish. 
Occasionally escaped from cultivation. 
Cardamine pratensis L, Meadow Bitter-cress, 
^Menomonee Vallev and Johnson's Woods. 
