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 alba occidentalis (Hook.) Regel
Betula beeniana A.Nelson
Betula elrodiana E.J.Butler
Betula fontinalis Sarg.
Betula microphylla fontinalis (Sarg.) M.E.Jones
Betula microphylla occidentalis (Hook.) M.E.Jones
Betula papyracea occidentalis (Hook.) Dippel
Common Name: Water Birch
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