champion tree

A term used by the tree register of the British Isles to mean a tree that is the tallest or has the biggest main-stem diameter of its species, giving two champions per species in a given area (county upwards).

diameter at breast height,
main stem,
main-stem volume,
Tree Register of the British Isles

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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