4. CRUCIFER.E. 117 



59. ISATIS TINCTORIA, Limi. 



Area (1*345***9* 11 »* 14 15 16). 



Alien. Has been repeatedly found in a half-naturalised 

 state ; and yet it can scarce be said to have acquired so 

 penaianent a possession of its localities as would justify its 

 reference to the category of denizens. In 1825, Mr. 

 Pamplin found it " among the stone-pits near Giiildford, in 

 great abundance ;" and in 1841, it was observed by Mr. 

 Mill " growing in prodigious luxuriance in chalk quarries, 

 close to the town of Guildford." I have specimens, through 

 the Botanical Society of London, collected by Mr. Brewer, 

 at " Albury, near Guildford." Professor Balfoiir finds 

 the plant in Haddingtonshire and Fifeshii'e. And locali- 

 ties in other counties may be found recorded in the Bo- 

 tanist's Guides ; but in how many of such localities the 

 plant itself would now be found, I cannot venture to say 

 or guess. 



60. Thlaspi arvense, Linn.' 



Area 1 2 3 4 5 6 * 8 9 10 11 12 13 14 15 16 17 18. 



South limit in Devon, Isle of Wight, Kent. C^^ctr*-^. "^^^ ^^- ^^^/jo 



North limit in Orkney and Sutherland. 



Estimate of pro\dnces 18. Estimate of counties 60. 



Latitude 50 — 60. British type of distribution. 



Agrarian region. Inferagrarian — SuperagTarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean amiual temperatm^e 52 — 46. 



