Raphanus CRUCIFERAE Sisymbrium 



R. sativus L. Radish. 



Fields and waste ground, escaping from cultivation. June. 

 Introd. from Europe. 



Brassica L. Mustard. Turnip. 



B. hirta Moench. {B. alba of manuals. See Wheeler: Rhodora 40, 

 306, 1938.) White Mustard. 

 Occasionally spontaneous after cultivation. Introd. from 

 Europe. 



B. kaber (DC) Wheeler var. pinnatifida (Stokes) Wheeler. (B. 

 arvensis of manuals. See the reference under B. hirta.) 

 Weed in fields and waste places. Nat. from Europe. 



B. juncea (L.) Cosson. Indian Mustard. 



Fields and waste ground. New Castle County. Nat. from Asia. 



B. japonica Siebold. Curled Mustard. 



An escape in cultivated ground : Wilmington, Commons, 30 June 

 1896 (A). Introd. from Asia. 



B. nigra (L.) Koch. Black Mustard. 



Common on roadsides and in waste ground, New Castle County. 

 Nat. from Europe. 



B. campestris L. Rutabaga. 



An infrequent escape from cultivation. Introd. from Europe. 



Diplotaxis DC. 

 D. tenuifolia (L.) DC. 



Rare weed in cultivated soil: near Georgetown (S), F. M. Jones, 

 24 May 1931 (T) ; field 1 mi. n. e. of Snow Hill (Wo), R. R. Tatnall, 

 1161, 31 May 1931 (T). Late May. Adv. from Europe. 



Conringia Link. 



C. orientalis (L.) Dumort. Hare's-ear Mustard. 



Infrequent in door-yards and waste places. June, July. Introd. 

 from Europe. 



Sisymbrium L. Hedge Mustard. 



S. officinale (L.) Scop. var. leiocarpum DC. 



Infrequent in meadows and about dwellings. May, June. Nat. 

 from Europe. 



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