160 4. CRUCIFER.E. 



progenitors had been earned thither. The essential point 

 of this long story is, simply that I know very little about 

 the species of Brassica, and their individual distribution ; 

 and that I suppose other British botanists not to be much 

 more enlightened thereon. 



114, b. Brassica Rapa, Linn. 



Area (1 2 3 4 * * 7 8 * 10 U 12 13 14 15). 



Alien. Though occasionally found in a wild state, I 

 presume the true tmnep to be derived from those now so 

 much cultivated by fanners. Brassica Enicastrum, also, 

 has occiuTed among clover in SuiTcy, but doubtless intro- 

 duced. 



115. Brassica Napus, Linn. 4* ^/^■///,J.O(fi^ 



Area 1 2 3 4 5 64 8 | 10 11 12 13 14 15 * * 18. 



South limit in Devon, Isle of Wight, Kent. 



North limit in the Hebrides and Moray. 



Estimate of provinces 18. Estimate of counties 70. 



Latitude 50 — 59. British tj'pe of distribution. 



Agrarian region. Inferagi'arian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 51 — 46. 



Colonist. Agrestal. Trusting to the reports and writ- 

 ings of other botanists, I set down this species as if distri- 

 buted generally over Britain ; the fom* pro\ances, for which 

 I have no authority to adduce, being those in relation to 

 which we possess only very incomplete published lists. I 

 have never seen — at least never recognized — the species; 



