珙桐为珙桐科、珙桐属树种。该属仅一种和一变种。据记载珙桐原产中国、北美及马来半岛。第四纪冰川时期后,珙桐属在国外已经绝迹,现为我国历特有,被列为国家一级重点保护植物。珙桐花色洁白,奇特美观,开花盛期树上如群鸽栖止,风吹又象白鸽展翅欲飞,因此国外有“中国鸽子树”之称,驰名世界。珙桐在我省的分布原无文献记述。1961年陕西省林科所李家骏同志曾在镇坪县文彩 Davidia involucrata Branch, Davidia genus species. The genus is only one and a variant. It is recorded that Davidia native to China, North America and the Malay Peninsula. After the Quaternary glaciation period, the Davidia genus has disappeared abroad and is now endemic to China and is listed as a national priority protected plant. Davidia flower color white, peculiar beauty, flowering period such as group pigeon habitat tree, the wind and white wings like flying wings, so foreign “Chinese pigeon tree,” said world famous. The distribution of Davidia in our province was not documented. In 1961, Shaanxi Provincial Forestry Branch by Comrade Li Jiajun Wenping in Zhenping County