» For the South African Thoroughbred racehorse, see: Horse Chestnut (horse).: For the Ancient Greek playwright, see: Aeschylus. The genus Aesculus, the buckeyes and Horse Chestnuts, comprises 13-19 species of woody trees and shrubs native to the temperate northern hemisphere, with 6 species native to North America and 7-13 species native to Eurasia; there're also several hybrids. Species are deciduous or evergreen. This genus has traditionally been treated in the ditypic family Hippocastanacea… (More on Aesculus)