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水青树(Tetracentren sinense Oliv.)亦称云青树(甘肃白龙江)、山桐(陕西宁陕),属木兰科(Magnoliaceae)植物。本种系第四纪冰川以来遗留下的“活化石”,因此,1889年 Oliver D.在虎克植物图志中发表该种后,曾引起世界上植物学者极大重视。目前,它在我周的分布范围虽然尚广,但因长期遭受砍伐,数量日渐减少,处于濒危状态,故被列为我国二级重点保护植物。
Tetracentren sinense Oliv. Also known as the Evergreen tree (Bailongjiang in Gansu), Sarkin (Shaanxi Ningshan), is a Magnoliaceae (Magnoliaceae) plant. This species was the “living fossil” inherited from the Quaternary glacier. Therefore, Oliver D., who published the species in his Hooke plant image in 1889, has drawn great attention from the world’s botanists. At present, although it is still widely distributed in my week, it has been listed as a Grade II priority protected plant in China due to its long-term deforestation and declining numbers.