118 4. CRUCIFER.E. 



Colonist. Agrestal. Widely, but rather thinly, scattered 

 over Britain from the south to the north coast. Though 

 I have collected specimens, and taken down Usts of the 

 plants, as seen by myself, in a goodly number of om* coun- 

 ties, I seem to have met with this species only twice ; name- 

 ly, in Fife and Sutherland. I should thus, from my own 

 eyes, have deemed it much rarer than appears to be the 

 fact ; since my compilation of notes includes locahties for 

 it in forty-five coimties. The difference here may in part 

 be attributable to the ciix-umstance of my own botanical 

 wanderings having inclined more to the mountains and 

 other wilder places, than to the com fields. 



61. Thlaspi perfoliatum, Linn. 



Area ^^tS^S^^^i*. [10 ju 12]. 



South limit in Oxfordshire and Gloucestershii-e. 



North limit in the same counties. 



Estimate of provinces 2. Estimate of counties 2. 



Latitude 51 — 52. Local tj^e of distribution. 



Agi'arian region. Inferagi'arian zone. 



Descends to 1 



Ascends to ? 



Range of mean annual temperature (48) ? 



Native. Rupestral ? An extremely local plant, the area 

 of which has been gi'eatly extended through misapphca- 

 tions of the name. Apparently it is quite hmited to the 

 two adjoining counties, indicated above for the south and 

 north hmits. But the dividing line between those counties, 

 being also the dividing line between the eastei'n pro^-ince 

 of Thames and the western province of Severn, the species 

 will stand proportionably liigher in a provincial census, 

 than in one founded on counties. I cannot state anjiihing 



