Other images:

• Close-up of some foliage and male catkins (early May) 
• Male catkins (early May) 
• Young fruits close-up (early May) 
• A leaf close-up, with some young fruits 

Voucher: Kostadinov 061, (URV)

Brief description: A large, monoecious tree with gray deeply-furrowed bark and hard, heavy wood. Leaves are compound, odd-pinnate, alternate, the three terminal leaflets usually the largest; leaflets are oblanceolate to obovate, entire, pinnately veined, pubescent beneath margins toothed. Flowers are unisexual, the staminate catkins coming in peduncled groups of three at the summit of previous year's growth, the pistillate flowers are solitary or in spikes of 2-10, terminating the branches, subtended by an involucre which ripens to a husk. Fruits are  a hard-shelled nut; the kernel is edible. 

Campus data: Moderately frequent everywhere in the wild on campus, not cultivated. Mature trees are usually medium-sized to large.