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Voucher: Kostadinov 123, (URV)
Brief description: Subgenus Erythrobalanus, red and black oaks. A monoecious tree to 25 m with the inner bark red. Leaves are simple, alternate, pinnately veined, with rounded sinuses, deeply pinnately 7-9 lobed with pointed, distally broadened to oblong lobes. The foliage is glabrous, except often for stellate hairs in the axils of the veins beneath; the margins have bristle-tipped teeth or shallow lobes. 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 turbinate-shaped, smooth inside. The acorns mature at the end of the second season and sprout at the beginning of the third.
Campus data: Frequent everywhere in the wild, not cultivated.