Horse-chestnut trees - Riehen, Switzerland

Horse-chestnut (Aesculus hippocastanum, Conker tree) derives its name from the erroneous belief that the tree was a kind of chestnut, together with the observation that eating them cured horses of chest complaints despite this plant being poisonous to horses. The processed and refined extract of horse-chestnut is used to cure varicose veins in legs and hemorrhoids.