horse chestnuts (aesculus hippocastanum). autumn background with heap of ripe brown horse chestnuts and prickly

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