19 



diyergence alone is evidently impossible. 



4. BRASSICA (Tourn.) L. 



8* Brassica alba (L.) Boiss. 

 Scientlfio name: 



Slnapis alba L. Sp. PI. 668. 1753. 



Brassica alba Boiss* Voy. Espag. 2,: 39. 

 1839-45. 



One of the species of 6ray*s Brassica originally 

 classed by Linnaens as generioally distinct from the oab- 

 bage> turnip* etc. 

 Common name: 



White mnstard* 

 Distribution and habitat: 



Adyentive or introduced from Europe; also found 

 in Western Asia . Waste places and fields, occasional, 

 mostly escaped from cultivation" (B. M*). 



PI. of Mon. Co.: "Escapes rarely". PI. Buf. Vic: 

 not listed. C F.: Fields, rare. Ithaca; field E. of 

 Freeville. Loc. Herb.: Ithaca, freeville. 



Collected once (1911) by the writer - by roadside, 



