180 7. VIOLACE^. 



the Castletown examples are to be refeiTed to V. flavicor- 

 nis, the area and the ranges of latitude, altitude, &c., must 

 be extended beyond those which I have at present ven- 

 tiu'ed to set down. 



136. Viola tricolor, Linn. 

 136,b. Viola arvensis, Mur. 



Area, general. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Shetland, Orkney, Hebrides. 



Estimate of provinces 18. Estimate of counties 82. 



Latitude 50 — 61. British type of distribution. 



Agrarian region. Inferagrarian— Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 350 yards, in the East Highlands. 



Range of mean annual temperatm'e 52 — 43. 



Native. Agrestal. Dissimilar as the extreme forms of 

 these (supposed two) species really appear, there are yet 

 so many gradually connecting links, that I find myself 

 quite unable to draw any line of distinction between them. 

 And while V. tricolor thus passes into V. arvensis on the 

 one side, it approximates so much towards V. lutea and 

 Curtisii on the other side, that a distinction becomes 

 scarcely more easy between them. I have specimens from 

 Castleton, Derbyshire, and New Brighton, Cheshire, which 

 bring tricolor and Curtisii into close connexion; and 

 others from Breadalbane, which I know not whether to call 

 tricolor or lutea. 



