no A NEW FLOEA OP NOETHUMBEfiLAND AND DURHAM. 



Vaccinium uliginosum. 

 Asplenmm germanicum. 

 Carex irrigua. 

 Hieracium argenteiim. 

 Callitriche autumnalis. 



Ligusticum scoticum. 

 Lamium intermedium. 

 Blysmus riifus. 

 Mertensia maritiraa. 

 Carex incurva. 



7. — Dividing the surface of the two counties into three zones 

 of altitude and climate, as explained already, only thirteen spe- 

 cies out of the nine hundred and thirty-five do not grow some- 

 where in the lower one, whilst four hundred and eighteen species 

 ascend into the middle zone and only one hundred and eight into 

 the highest of the three. Fifty species are essentially restricted 

 to the sea-coast, and forty-five shew a decided preference for the 

 dry-soiled and especially the limestone tracts. 



