Buckeye, any of about six species of North American trees and shrubs in the genus Aesculus of the soapberry family (Sapindaceae). The name refers to the resemblance of the nutlike seed, which has a pale patch on a shiny red-brown surface, to the eye of a deer.  A number of buckeye species are valued as ornamental trees for their handsome candelabra-like flower clusters. Both the young foliage and the seeds are poisonous.  Buckeye species are deciduous (i.e., they shed their leaves seasonally) or evergreen. The  flowers are often showy and feature four or five fused petals. The fruits are dry capsules and have hard leathery husks that are smooth to weakly spiny. The fruits turn brown in fall and split into three parts to release one to three glossy brown inedible seeds. 

The most-notable species is the Ohio buckeye which is primarily found in the Midwestern region of the United States. The tree grows up to 21 metres (70 feet) in height and has twigs and leaves that yield an unpleasant odour when crushed.  The seeds contain tannic acid and are poisonous to cattle and humans. The plant is the state tree of Ohio, and the term buckeyes is used to refer to Ohioans in general as well as to the sports teams and players of the Ohio State University.

The bottlebrush buckeye (A. parviflora) is an attractive shrub, native to Georgia and Alabama, that bears white flowers in erect spikes about 30 cm (1 foot) long.  Whatever your use for a  buckeye,  medical miracle or landscape plant, remember this Southern beauty has legendary powers. Many old-timers and not so-old-timers
believe the fruit of the  buckeye will bring its owner good luck all year around. It is a legendary protector
against arthritis when carried in one’s pocket and, if you carry one in your right-hand pocket, you will always be
lucky with cards.

The Encyclopedia Britannica

We have dozens of trees growing at the park.