The harbinger of fall at the Linda Hall Library is the Ohio Buckeye tree. While there are five Ohio Buckeyes on our grounds, only one (pictured) shows fall color, and is always the first tree on our grounds to begin showing color. The Ohio Buckeye is the State Tree of Ohio. Kansas City is in its native range, which includes most of the upper Midwest from far western Pennsylvania to eastern Kansas, Oklahoma and northeastern and central Texas. The nuts, called buckeyes, are poisonous to livestock and humans, but considered good luck charms in many regions of the United States.