while the lower slopes of the mountains are dominated by sessile oak ("quercus petraea"), above the mountains are virtually treeless and are dominated by blanket bog and wet heath. the bogs in the park mostly have a characteristic flora that includes heather ("calluna vulgaris"), bell heather ("erica cinerea") and western gorse ("ulex gallii"), with occasional bilberry ("vaccinium myrtillus"). large-flowered butterwort ("pinguicula grandiflora") is common. the bogs also support a number of notable species, including mosses ("sphagnum pulchrum", "s. fuscum", "s. platyphyllum", "s. strictum", "s. contortum" and "calliergon stramineum"), liverworts ("cladopodiella francisci" and "calypogeia azurea") and lichens ("cladonia mediterranea", "c. macilenta", "c. rangiferina", "c. arbuscula" and "cetraria islandica").