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Common name: Rock chestnut oak.
Voucher: Kostadinov 108, (URV)
Brief description: Subgenus Lepidobalanus, white oaks. A monoecious tree to 30 m with thick, deeply furrowed bark. Leaves are obovate to oblong or ovate, simple, alternate, entire, pinnately veined, thinly stellate-hairy, margins have 10-15 regular, oval, obtuse teeth, no bristle tips present. Flowers are unisexual, the staminate in slender catkins, the pistillate solitary or in small spikes. Fruits are a nut (acorn), partly enclosed by the persistent involucre -- the acorn cup. The acorn cup is hemispheric. The acorns mature and sprout at the end of the first season.
Campus data: Moderately frequent everywhere in the wild, not cultivated.