Hackberry n. : A genus of trees (Celtis) related to the elm, but bearing drupes with scanty, but often edible, pulp. C. occidentalis is common in the Eastern United States.

Example:
Any experience with the common Hackberry tree?

Taxonomy
Hackberry, Celtis, species, Planch, Chinese Hackberry, Beak, MEXICO, free encyclopedia, Japanese Hackberry, North America, the leaves, AUSTRALIA, USA, African, C. sinensis, Astraptes fulgerator, family, SOUTH AMERICA.

Defination from the web:
Hackberry (Celtis) is a genus of about 60-70 species of deciduous trees widespread in warm temperate regions of the Northern Hemisphere, in ... Especially Chinese Hackberry (C. sinensis) is suited for bonsai culture, while a magnificent Pseudo-hackberry (C. japonica) in Daegu-myeon is one ...