Betulaceae S.F. Gray. Birch Family.
A family of 6 genera and about 150 species, primarily of subarctic to cold temperate regions of the Northern Hemisphere, but extending through Central America to n. South America. The two subfamilies recognized here are sometimes elevated to family status, as by Govaerts & Frodin (1998).
Ref: Furlow (1990); Furlow (1997) In Flora of North America Editorial Committee (1997); Govaerts & Frodin (1998); Hardin (1971a); Kubitzki, Rohwer, & Bittrich (1993). Show full citations.