20 FLORA OF CAMBRIDGESHIRE. 



Cultivated ground. A doubtful native, except in the 

 Fens, where it seems to be spontaneous. A. June to August. 

 Common throughout the county. 



Bbassica Linn. 



%\. B. campestris Linn. 



There are two forms of this species, viz. : 



u.. B. campestris Linn. Hensl. Cat. ed. ii. 8. Napus 

 sylvestris. B. C. 102. Wild Navew. 



p. B. Bapa Linn. Bapum vel Bapa, B. C. 134. Ba- 

 pum officinarum, M. M. 79. B. Bapa, M. PI. 16. Eelh. 

 272. Also Eapum radice ollonga, E. C. 134. M. M. 79. 

 B. Bapa /3. M. PL 15. Turnip. 



Fields, occasionally found. A very doubtful nature ; 

 probably always, certainly the var. /3, accidently introduced. 

 A. or B. July, August. 



+ 2. B. NapUS Linn. Bape. Coleseed. 



Rapum sylvestre, R. C. 134. M. M. 79. B. Napus, M. 

 PI. 15. Eelh. 271. 



Fields, probably not a native. A. or B. May, June. 

 1. Allington Hill. 



Sinapis Linn. 



1. S. nigra Linn. Black Mmfard. 



Sinapi II. sive vulgar -e, E. C. 155. S. officinarum, M. M. 

 79. S. nigra, M. PI. 15. Eelh. 273. 



Willowy river-banks; rarely in fields, where it is acci- 

 dental. A, June to August. 



3. On banks newly cast up behind the colleges; Eay. In 

 small quantity at Harlton ; K — 4. Cottenham and Water- 

 beach Fens. By the Mare Way. Westwick; N. — 5. Clay- 

 hythe. Upware. — 6. Eoswell Pits, Ely. In the village of 



