DISTRICTS. XXIU 



Ranunculus confusus. 



Genista anglica. 



Vicia lutea. 



Bidens cernua. 



Inula Helenium. 



Hieracium horeale. 



Verhascum nigrum, together with the hybrid Thapso-nigrum. 



Statice hinervosa. 



Rumex Hijdrolapathum. 



R. maximus. 



Carex fulva. 



II. West Tamar. — As the Tamar separates Devon and Cornwall, its 

 basin is divided in order to preserve the proper limits of the counties. 

 This district comprises the portion that belongs to Cornwall. The 

 boundaries are, north, the line of limit ; west, the east of District i. ; 

 south, the Channel ; east, a Ime through the centre of the Tamar, Its 

 shape is irregular, owing to severance of it and District i. The two might 

 have been combined by treating the Notter as a tributary of the Tamar, 

 had it not been for the disproportionately large division they would have 

 formed. This District is rich in semi-maritime species, owing to the large 

 influx of tidal water up its creeks and streams. On the other hand, 

 ericetal and sylvestral plants are not numerous, owing to a comparatively 

 small extent of heath and woodland. Between Saltash and Calstock 

 much of the aboriginal wood has been destroyed in order to make way 

 for the cultivation of the cherry, strawberry, and other fruits. The 

 following species are found only in this District : 



Potentilla argentea. 

 Valerianella eriocarpa. 

 Gastridiu m leiidigerum. 



The first is perhaps now extmct. 



South Devon. III. East Tamar and Tavy. — The Devon portion of 

 the watershed of the Tamar would of itself have proved so small and 

 narrow a district that the watershed of the Tavy has been combined -with 

 it. This arrangement is a not unnatural one, as the Tavy, although of 

 itself an important river, has quite the character of a tributaiy of the 

 Tamar. The boundaries of this District are, north, the line of limit ; 

 west, the line passing along the Tamar, separatmg Devon and Cornwall ; 

 south, Plymouth Sound ; east, the turnpike road leading from Plymouth 

 by Roborough to Prince Town. From having no open line of coast some 

 of the decidedly maritime plants are wanting in this District, but the 

 varied nature of its surface causes it to have a large number of species. 



