CRUCIFER^ 23 



14. Sin APIS, L. 



Seeds in one row; sepals spreading; flowers yeliov/. 

 Not alpine. 



S. nigra, L., Black Mustard ; 5. 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. DiPLOTAXIS, DC. 



Seeds in two rows ; sepals spreading ; flowers yellow ; 

 leaves pinnatifid. Not alpine. 



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

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



16. EruCASTRUM, Pr. 



Seeds in one row ; otherwise like Diplotaxis. Not 

 alpine. 



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

 Pollichiiy Schp., with smaller pale yellow flowers and 

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

 feldia adpressa, 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. 



