Other images:

• Leaf close-up 
• Young acorns (early May) 

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.