Species of the genus Betula are a difficult group taxonomically because of their high vegetative variability and frequent hybridization. Many species have been founded on only slight differences and many of these have subsequently been reduced to synonymy. Many morphologic and cytologic studies have attempted to deal with variation within the genus or its subgroups. Species of Betula form a polyploid series, with chromosome numbers of 2 n = 28,
, and 112, plus additional numbers in some hybrids.
Betula bhojpattra japonica Shirai
Betula ganjuensis Koidz.
Betula incisa (Koidz.) Koidz.
Betula ircutensis Sukaczev
Betula komarovii Perfil. & Kolesn.
Betula lanata (Regel) V.N.Vassil.
Betula longilobata Sipliv.
Betula nikoensis Koidz.
Betula paraermanii V.N.Vassil.
Betula prochorowii Kuzen. & Litv.
Betula saitoana Nakai
Betula shikokiana Nakai
Betula ulmifolia glandulosa H.J.P.Winkl.
Betula vassiljevii Dylis
Betula velutina V.N.Vassil.
Betula vulcani H.Lév. & Vaniot
Common Name: Gold Birch
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