4. CRUCIFER.E. 151 



Denizen. Viatical ? It is rather puzzling to refer this 

 plant to any type of distribution, to any category of citi- 

 zenship, or even to any of the terms which express the 

 kind of local situation. It still grows about London and 

 Berwick-on-Tweed ; and did grow about Oxford within 

 twenty years ago, if not there now. In Buckinghamshire, 

 Essex and Cambridgeshire, it was reported on good, 

 though now ancient, authority. I suspect some inadver- 

 tence with reference to the county of Somerset ; and those 

 of Worcestershu'e and Derbyshire need to be confirmed 

 on more trustworthy authority. Said to have covered the 

 groimd after the great fire of London. 



104. Sis^TViBRiuM Sophia, Linn. 



Area 1 2 3 4 5 6 7 8 9 10 11 * 13 14 15 * 17. 



South limit in Cornwall, Dorset, Kent. 



North limit in Ross-shii-e and neai* Inverness. 



Estimate of provinces 16. Estimate of comities 60. 



Latitude 50 — 58. British type of distribution. 



Agi-arian 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 temperatiu-e 51 — 47. 



Native. Viatical. Thinly scattered through Britain ; 

 but I caimot select more than about a score of counties, in 

 which the probability seems to be against its existence : 

 these are chiefly on the western side of the island, where 

 our botanical infoimation is less full than for the easteni 

 side. 



