148 4. CRUCIFER^.. 



decreasing in frequency northwards so decidedly as almost 

 to justify its assignment to the English type, notwithstand- 

 ing its occurrence in two of the Highland provinces. 

 Rises very little above the midagrarian zone. 



100. Nasturtium sylvestre, Br. -^ ^r/- ///.^.J^^ 

 100, b. Nasturtium anceps, Reich. 



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



South limit in Devon and Sussex, ^^/t^t^ur,^ . 



North limit in Edinburghshu'e and Dumfriesshire. 



Estimate of provinces 14. Estimate of counties 50. 



Latitude 50 — 56. English type of distribution. 



Agrarian region. Inferagrarian — Midagrarian 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. Paludal. Less fi-equent than N. ten-estre, 

 though I have reason to think that the name of the latter 

 is occasionally misapplied to examples of the present spe- 

 cies ; the one being thus made to appear more frequent, 

 and the other less frequent, than the facts rightly warrant. 

 Two localities in Fifeshire have been mentioned to me, or 

 one locality under two names ; " St. Davids" and " Inver- 

 keithing ;" but that county is so suspicious a locality, on 

 its south coasts, I fear to receive it unless supported by 

 the existence of a species in several spots, or in other 

 neighbouring counties, northward of the Forth. In the 

 ' New Guide,' the vicinity of Aberdeen was indicated for 

 this species on the authority of a checked catalogue from 

 Dr. Dickie. Some mistake is to be feared, the species 

 being omitted from the ' Flora Abredonensis. Of N. anceps 

 I know nothing. It is said to grow in the provinces of 

 Ouse, Severn, Tync and East Lowlands. 



