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Aesculus (horse chestnut, buckeye; family Hippocastanaceae) A genus of deciduous trees that have large, sticky buds, opposite palmate leaves, and showy terminal panicles of white or red flowers. There are about 13 species, 1 found in deciduous forests of south-eastern Europe, 5 in India and eastern Asia, and 7 in N. America. They are much cultivated and the wood is sometimes used to make furniture.