|Common name: Post oak.
Voucher: Kostadinov 106, (URV)
Brief description: Subgenus Lepidobalanus, white oaks. A monoecious tree with rough, deeply furrowed bark and persistently pubescent petiole and twigs. Leaves are thick, obovate or cruciform, simple, alternate, with a few big rounded lobes, pinnately veined, pubescent with the hairs branched. 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, with flat scales; the nut is ovoid. The acorns mature and sprout at the end of the first season.
Campus data: Occasionally in the wild on campus. More than a dozen individuals encountered.