CRUCIFER^E 23 



14. Sin APIS, L. 



Seeds in one row; sepals spreading; flowers yellow. 

 Not alpine. 



S. nigra^ L., Black Mustard ; vS. alba^ L., White Mus- 

 tard ; 5. arvensisy L., Charlock ; and 5. Cheira7ithus, 

 M.K., with very deeply divided leaves; are all common 

 weeds in cultivated ground. 



15. DiPLOTAXIS, DC. 



Seeds in two rows; sepals spreading; flowers yellow; 

 leaves pinnatifid. Not alpine. 



D, muralis^ DC, with hispid leafy stem ; D. tcnui- 

 folza, L., with much larger flowers ; in waste places. 



16. EruCASTRUM, Pr. 



Seeds in one row ; otherwise like Diplotaxis, Not 

 alpine. 



E. obtusanguluniy Rchb., with amplexicaul leaves; E. 

 Pollichiij Schp., with smaller pale yellow flowers and 

 leaves not amplexicaul ; and E. incanuin, Koch (Hirsch- 

 feldia adpressaj Moench.), with small yellow flowers and 

 short cylindrical seed-vessel, the upper leaves lanceolate, 

 undivided ; are Southern lowland plants. 



17. Eruca, DC. 



Seeds in two rows ; sepals equal at the base ; seed- 

 vessel cylindrical ; stigma bilobed. Not alpine. 



E. sativa. Lam. ; flowers dirty-white veined with 

 violet, leaves pinnatifid ; slopes ; Rhone valley. 



