genus of mostly woody relatively primitive dicotyledonous flowering plants with flowers often unisexual and often borne in catkins

monoecious trees and shrubs (including the genera Betula and Alnus and Carpinus and Corylus and Ostrya and Ostryopsis)

north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant

medium-sized tree with brown-black bark and woody fruiting catkins; leaves are hairy beneath

native to Europe but introduced in America

shrub or small tree of southeastern United States having soft light brown wood

monoecious trees and shrubs (including the genera Betula and Alnus and Carpinus and Corylus and Ostrya and Ostryopsis)

north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant

medium-sized tree with brown-black bark and woody fruiting catkins; leaves are hairy beneath

native to Europe but introduced in America

shrub or small tree of southeastern United States having soft light brown wood