|Common name: Black-jack oak.
Voucher: Kostadinov 038, (URV)
Brief description: Subgenus Erythrobalanus, red and black oaks. A small, monoecious tree with deeply checked bark and pubescent twigs. Leaves are broadly obovate, simple, alternate, shallowly 3-lobed to entire, hairy and brown-green beneath, the margins with bristle-tipped teeth. 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. The acorns mature at the end of the second season and sprout at the beginning of the third.
Campus data: Very rare in the wild on campus. One individual encountered.