Betula nigra L., Betulaceae

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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.