CRUCIFERAE 61 



2. Sisymbrium altissimum L. 



Common over most of the state. Cowles; Ewing; Grand Island; 

 Franklin; Newark. 



3. Sisymbrium loeselii L. 



In an alfalfa field near Arcadia. 



6. Sinapis. 449. 

 1. Sinapis a!ba L. 



Brassica alba (L.) Boiss. 

 Reported from Weeping Water. 



7. Brassica. 449. 



Pods less than 2 cm. long. 1. B. nigra. 



Pods over 2 cm. long. 



Stem glabrous, beak not over % the length of the body of the pod. 



2. B. juncea. 

 Stem hispid, beak nearly half the length of the body of the pod. 



3. B. arvensis. 



1. Brassica nigra (L.) Koch. Wild IVIustard. 

 A common weed, especially in oat fields, over most of the state. 

 Kearney; Ponca; Wahoo; Weeping Water; Red Cloud; Xemaha; 

 O'Neil. 



2. Brassica juncea (L.) Cosson. 



Common in Kansas, according to A. S, Hitchcock. 



3. Brassica arvensis (L.) B. S. P. 



Introduced from Europe and frequent as a weed in grain fields. 

 Douglas County; Lincoln. 



8. Barbarea. 451. 



1. Barbarea barbarea (L.) Mc. M. 



Barbarea vulgaris R. Br. 

 Accidental in cultivated ground. Callaway. 



9. Roripa. (Radicula.) 451. 



Terrestrial or marsh plants, leaves pinnatifid, petals yellow. 

 Plants glabrous or nearly so. 



Styles 2-3 cm. long. 1. R. sinuata. 



Styles 1 mm. long or less. 



Flowers 2-3 mm. broad, pericels 2-4 mm. long. 2. R. obtusa. 



Flowers 4-6 mm. broad, pedicels G mm. long in fruit. 



3. R palustris. 



Plants more or less hirsute. 4. R. hispida. 



Aquatic plants, leaves pinnate, petals white. 5. R. nasturtium. 



1. Roripa sinuata (Xutt.) A. S. Hitchcock. 



A common weed all over the state. Bellevue; Crete; Fairbury; Fre- 

 mont; Kearney; Lincoln; Nebraska City; St. James; Whitney. 



2. Roripa obtusa (Nutt.) Britton. 



Common in wet ground or shallow water. Big Springs; Crete; Min- 

 den; Red Cloud; Wahoo; Whitman; Newark. 



