single spikey capsule of aesculus hippocastanum, the horse chestnut on the left side with blue sky background.

aesculus also america autumn avenues background blue branches brown buckeye called capsule chestnut close colorful conker deciduous europe european fall family flowering foilage fruits growing hermaphroditicflowered hippocastanum horse horsechestnut horseshoe large left like lychee nut parks plant sapindaceae season seeds side sky soapberry sometimes spanish species specific spikey stout synoecious tree