From Flora of Indiana (1940) by Charles C. Deam

Usually a frequent tree in all parts of Indiana although it appears to be absent from a few of the northwestern counties. Because it is poisonous to stock, land owners from the earliest times have tried to exterminate it. It is usually associated with beech, sugar maple, and American linden. The pubescence on the under surface of the leaflets is quite variable as to abundance and duration. Trees with the leaflets permanently pubescent beneath are known as Aesculus glabra f. pallida (Willd.) Fern.