What Tree Is It?

Husk mostly smooth, sometimes with warts or slight spines

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CAUTION: Read both fact pages to separate these two similar trees.

Husk smooth, about 1" to 2" in diameter, containing one to three shiny brown nuts, each about 1" in diameter
Red Buckeye

Husk usually somewhat larger, about 2" in diameter, usually containing two nuts, each nut about 1" to 1 1/2" in diameter
Yellow Buckeye