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The most familiar member of the genus worldwide is the common horse chestnut, "Aesculus hippocastanum". The yellow buckeye, "Aesculus flava" (syn. "A. octandra"), is also a valuable ornamental tree with yellow flowers, but is less widely planted. Among the smaller species is the bottlebrush buckeye, "Aesculus parviflora", a flowering shrub. Several other members of the genus are used as ornamentals, and several horticultural hybrids have also been developed, most notably the red horse chestnut "Aesculus" × "carnea", a hybrid between "A. hippocastanum" and "A. pavia".