whitebeam
A genus of trees containing the natives whitebeam (S.aria), rowan or mountain ash (S.aucuparia) and wild service tree (S.torminalis). A group of species related to the whitebeam, including S.bristoliensis, S.eminens, S.subcuneata, S.vexans and S.wilmottiana, are found on limestone soils in the south-west of England and Wales. They are thought to have evolved since the last ice age and are Britain's only endemic tree species. They are also priority species.
This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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