Betula alba subsp. nana (L.) Bonnier & Layens appears in other Kew resources:
First published in Tabl. Syn. Pl. Vasc. France: 289 (1894)
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Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
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