CRUCIFER^: 23 



14. SlNAPIS, L. 



ieds in one row; sepals spreading; flowers yellow, 

 [ot alpine. 



5. nigra, L., Black Mustard ; 6". alba, L., White Mus- 

 tard; 5. arvensis, L., Charlock; and 5. Cheiranthus, 

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

 weeds in cultivated ground. 



15. DlPLOTAXIS, DC. 



Seeds in two rows ; sepals spreading ; flowers yellow ; 

 leaves pinnatifid. Not alpine. 



D. muralis } DC, with hispid leafy stem; D. tenui- 

 folia } L., with much larger flowers ; in waste places. 



16. ERUCASTRUM, Pr. 



Seeds in one row; otherwise like Diplotaxis. Not 

 alpine. 



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

 Pollichiij Schp., with smaller pale yellow flowers and 

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

 feldia adpressa, Mcench.), 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. 



