closeup view of fresh horse chestnut. autumn background with ripe brown horse chestnut and prickly shell on the top

aescub aesculus antiinflammatory autumn background barb beautiful biology botany brown buckeye castanea castor chestnut chestnuts close closeup conker environment escin european fall foliage folk forest fruit fruits hippocastanum horse horsechestnut hull medicine nature october outdoors prickle prickly prong protection quill ripe round scavenging seed september spanish spike spine thorn tree vascular