Buckeye
Buckeyes are poisonous, but some native American tribes leached the pulverized nuts to make them edible.
Several members of the genus are used as ornamentals. The horsechestnut, red buckeye, bottlebrush buckeye, and painted buckeye are all planted for their showy flowers. Several showy horticultural hybrids have been developed.
The Ohio buckeye is the state tree of Ohio.

Aesculus hippocastanum
Buckeye is the name given to trees and shrubs of the genus Aesculus. These woody plants have opposite, palmately divided leaves. The most familiar member of the genus worldwide is the horsechestnut, Aesculus hippocastanum, formerly put in its own genus, Hippocastanum but now usually included in Aesculus.
Buckeyes and Horsechestnuts
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Magnoliopsida
Order: Sapindales
Family: Hippocastanaceae[?]
Genus: Aesculus Species Aesculus arguta: Texas buckeye
Aesculus buckleyi
Aesculus californica: California buckeye
Aesculus chinensis: Chinese buckeye
Aesculus flava (aka A. lutea or octandra):
yellow buckeye
Aesculus glabra: Ohio buckeye
Aesculus hippocastanum: horsechestnut
Aesculus indicum: Indian horsechestnut
Aesculus neglecta: dwarf buckeye
Aesculus parviflora: bottlebrush buckeye
Aesculus pavia: red buckeye
Aesculus sylvatica: painted buckeye
Aesculus turbinata: Japanese horsechestnut