A review of the sub-species carpatica and tortuosa within the species betula pubescens Ehrh.

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Abstract
The classifications employed during the last decade for defining sub-specific variation within the species B. pubescens Ehrh. have produced a situation in which the terms carpatica and tortuosa, originally and usually applied to separate taxa, could be regarded as synonymous. This has been caused by the association of both terms, at different times, with B. odorata Bechst. Recent research at Merlewood supports the use of the term ssp. tortuosa and its distinction from ssp. carpatica whose presence in the British flora requires further verification.

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