-4- 



Pi". Cauline leaves short, sparingly 

 stellate-pubescent. G.l, B.30. 



Praba * 

 sp» arablsans * 

 EFJ. Cauline leaves larger, rough- 

 pubescent, Soli dago- like* 

 G.31, B.33. Arabis. 



sp. canadensis * 

 IPPP. Cauline leaves spatulate to 

 linear, mostly glabrous; 

 basal leaves lyrate* 



Do*, sp* Ivrata * 

 BB. Corolla yellow or yellowish* 



C* Corolla 1 cm* broad or more* G*15; B,12,13* 



Bra33ica *( Sinapi8) « 

 CO. Corolla less than 1 cm* broad* 



D* Corolla light or whitish yellow* 



E* Cauline leaves entire, oblanceolate 



or spatxilate, densely stellate-pubes- 

 cent* G*4, B*35. Al.vssum* 

 EE. Cauline leaves lanceolate, entire or 

 nearly so, upper ones clasping; 

 glabrous or nearly so* G.li, B.28* 



Camel ina * 

 EEE. Caiiline leaves pinnatifid or finely 

 dissected, densely pubescent* 

 Gr.l9; B.9,31* Sisymbrium * ( Sophia ). 



