In the woodland on the slopes, ash tends to become more dominant, often in association with birch ( " Betula pendula " ) on the drier areas and alder ( " Alnus glutinosa " ) in the wetter areas.
12.
In addition to the pine and the spruce, " Betula pendula ", " Betula pubescens ", " Populus tremula ", and " Alnus glutinosa " ( the latter along some creeks ) are the taller tree species encountered in the national park.
13.
Pine forests ( with " Pinus sylvestris " ) are the most widespread and occupy 51 % of the forested area of the Karelian Isthmus, followed by spruce forests ( with " Picea abies ", 29 % ) and birch forests ( with " Betula pendula " and " C . canescens ".
