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裸子植物在距今约3～4亿年前的古生代泥盆纪发生,于石灰纪、二迭纪繁盛,到中生代三迭纪、侏罗纪开始衰退。银杉(Cathayd argyrophylla Chun et Kuang)系裸子植物银杉属,随着古地理,气候的变迁,银杉早在世界的其他地区绝迹,仅发现于我国的广西、四川、湖南,作为古生物史的见证,是极为珍贵的。一九八○年八月,我省的道真县沙河林区的小沙河也发现了银杉,经初步调查并采集了标本和拍照。标本号为80～144,现存贵州农学院及北京植物所。现将沙河林区的银杉及其植被的调查简报如下。
Gymnosperms took place in Paleozoic Devonian dating back from about 300 million to 400 million years ago. During the limestone and Permian Triassic, the Jurassic began to decline. Cathayd argyrophylla Chun et Kuang is a genus of the genus Prunus. With the change of ancient geography and climate, the silver fir has disappeared in other parts of the world and is only found in Guangxi, Sichuan and Hunan in China, Testimony is extremely precious. In August 1980, silver cedar was also found in Xiaoshahe, Shahelin district, Daozhen County in our province. After preliminary investigation and collection of specimens and photographs, Specimen No. 80 ~ 144, the existing Guizhou Agricultural College and Beijing Institute of Botany. Brief introduction of the survey of silver fir and its vegetation in Shahelin are as follows.