4. CRUCIFER^. 145 



. 95. Barbarea vulgaris, Br. 



95, b. Barbarea stricta, Andrz.^ /w^ ///./. -5^- 



96. Barbarea arcuata, Reich. t, >< /i. ^S3. 



Area 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Moray and Renfrewshire . 



Estimate of pro^dnces 16. Estimate of counties 70. 



Latitude 50^58. British type of distribution. 



Agrarian region. Inferagi-arian — Superagraiian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 51—47. 



Native. Viatical, &c. Grows by road-sides, on the 

 banks of ditches and streams, in waste and cultivated 

 ground, &c. On the whole, nearer to the definition of 

 'viatical,' than to that of any other of the terms used. Like- 

 ly to be foimd in the West Highlands. Mr. BoiTcr finds 

 B. stricta in Northamptonshire and Yorkshire, B. arcuata 

 in Denbighshire and Northumberland. Judging by de- 

 scriptions, I had thought that B. arcuata must have more 

 the character of a species than B. stricta, inasmuch as its 

 seeds are represented to differ in form, while those of the 

 other two are described in almost the same terms. In a 

 late No. of the ' Phytologist,' Mr. BoiTer has expressed a 

 different opinion, which I quote here : — " By the bridge 

 over the Alne, going fi-om Alnwick towards Embleton, I 

 gathered what I take for B. arcuata. It seems to me fai- 

 less satisfactorily distinct fi-om B. vulgaris than B. stricta, 

 which is so common about York, and in other parts of York- 

 shire." (Phjiiol. ii. 433) . Whether either or both are, or are 

 not, distinct species from B. vulgaris, there can be no doubt 



u 



