|Common name: River birch, red birch.
Voucher: Kostadinov 055, (URV)
Brief description: A big, monoecious tree, with brown bark exfoliating in thin layers. Leaves are simple, ovate, oblong to deltoid, alternate, entire, pinnately veined, margins double serrate-toothed to entire toward the base, villous on the veins beneath. Flowers are unisexual catkins, the staminate occurring near the apical bud, the pistillate -- on upper axillary ones. Fruits are depressed-ovate and pubescent.
Campus data: Abundant everywhere in the wild, not cultivated. Mature trees are usually of a considerable size.