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31 birches species
Betula papyrifera
Betula alleghaniensis
Betula populifolia
Betula pumila
Betula lenta
Betula occidentalis
Betula glandulosa
Betula nigra
Betula pendula
Betula cordifolia
Betula neoalaskana
Betula michauxii
Betula nana
Betula pubescens
Betula platyphylla
Betula davurica
Betula utilis
Betula maximowicziana
Betula lanata
Betula fruticosa
Betula uber
Betula costata
Betula tianschanica
Betula turkestanica
Betula chinensis
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