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The 1- to 2-inch-long fruit is a yellow, leathery capsule with deciduous
prickles, becoming pale brown and smooth as it ripens. The capsule splits
open to release 1 or 2 large seeds in September to mid-October. The smooth,
shiny, dark-brown, poisonous seeds resemble those of the horse chestnut
and are somewhat reminiscent of the eye of a deer (hence the name, "buckeye"). |