珙桐(davidiainvolucrate)是珙桐科珙桐属落叶乔木,为我国特有的珍稀树种和世界著名的珍稀观赏树,国家一级重点保护植物。皖南黄山市祁门县从2002年开始,在江西九江种子公司引种,2006年再次引种,都在大洪岭林场苗圃育苗,种子虽经过处理,但发芽率都在12%以内,这是造成珙桐优良树种在祁门 Davidia involucrata (Davidia involucrate) is Davidia involucrata deciduous trees, endemic to China rare species and the world-famous rare ornamental trees, the state-level key protected plants. Qimen County in Huangshan City of Anhui Province since 2002, introduced in Jiangxi Jiujiang seed companies introduced again in 2006, are Dahongling forest nursery seedlings, although the seeds have been processed, but the germination rate is less than 12%, which is caused by 珙Tong excellent tree species in Qimen