The tree species Aesculus glabra is commonly known as Ohio buckeye, American buckeye, or fetid buckeye.

It is native primarily to the Midwestern and lower Great Plains regions of the United States, extending southeast into the Nashville Basin. It is also found locally in the extreme southwest of Ontario, on Walpole Island in Lake St. Clair, and in isolated populations in the South. It is a medium-sized deciduous tree growing to 15–25 m (50–82 ft.) tall.

The leaves are palmately compound with five (rarely seven) leaflets, 8–16 cm (3-6 in.) long and broad. The flowers are produced in panicles in spring, yellow to yellow-green, each flower 2–3 cm (3/4 - 1⅛ in.) long with the stamens longer than the petals (unlike the related Yellow Buckeye, where the stamens are shorter than the petals). The fruit is a round or oblong spiny capsule 4–5 cm (1½ - 2 in.)diameter, containing 1-3 nut-like seeds, 2–3 cm (3/4 - 1⅛ in.) in diameter, brown with a whitish basal scar.

The fruits contain tannic acid, and are poisonous for cattle, and possibly humans. Native Americans would blanch them, extracting the tannic acid for use in leather.

Ohio (ⁱ/oʊˈhaɪ.oʊ/) is a state in the Midwestern United States. Ohio is the 34th most extensive, the 7th most populous, and the 10th most densely populated of the 50 United States. The state's capital and largest city is Columbus.

The name "Ohio" originated from Iroquois word ohi-yo’, meaning "great river". The state, originally partitioned from the Northwest Territory, was admitted to the Union as the 17th state (and the first under the Northwest Ordinance) on March 1, 1803. Although there are conflicting narratives regarding the origin of the nickname, Ohio is historically known as the "Buckeye State" (relating to the Ohio buckeye tree) and Ohioans are also known as "Buckeyes".

The government of Ohio is composed of the executive branch, led by the Governor; the legislative branch, which comprises the Ohio General Assembly; and the judicial branch, which is led by the Supreme Court. Currently, Ohio occupies 18 seats in the United States House of Representatives. Ohio is known for its status as both a swing state and a bellwether in national elections.