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The Forestry Commission website says there are around 7, 000 black poplars in Britain.
BBC: Black poplar trees found in Denbighshire lay-by 'unique'
Mike Hughes, from woodland management body Coed Cymru, said the location of the black poplars near the village of Rhewl was already known.
Black poplars are threatened by disease and the hope is that the discovery of the new clones will help identify strains that will be resistant.
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