银杏科植物银杏(Ginkgo biloba)为我国特产,又称白果、公孙树、鸭脚树,是现存种子植物中最古老的孑遗植物,最早出现于3.45亿年前的石炭纪,中生代侏罗纪银杏曾广泛分布于北半球,白垩纪晚期开始衰退。至50万年前,由于第四纪冰川运动,地球突然变冷,绝大多数银杏植物濒于绝种,在欧亚、北美绝大部分地区灭绝, Ginkgo biloba Ginkgo biloba (Ginkgo biloba) for our specialty, also known as ginkgo, Gongsun Shu, duck feet tree, is the oldest relict plant seed plants, first appeared in 345 million years ago, the Carboniferous, Mesozoic Jurassic ginkgo Was widely distributed in the northern hemisphere, the late Cretaceous began to decline. Until 500,000 years ago, due to the sudden cooling of the Earth due to the Quaternary glacier movement, the vast majority of ginkgo plants were on the verge of extinction and were extinct in most parts of Europe and Asia and North America.