Study on the Floristics of Seed Plants in Xingdoushan Nature Reserve, Hubei

Based on comprehensive field surveys undertaken in Xingdoushan Nature Reserve, Hubei Province, from 2013 to 2015, resulting in 3441 plant specimens, we analyzed the floristic features of seed plants in Xingdoushan. A total of 1617 species belonging to 678 genera and 138 families were found, which consisted of 19 gymnosperms (15 genera and 6 families) and 1598 angiosperms (663 genera and 132 families). Our results showed that there were more tropical plant families (66.06%) than temperate ones (33.94%), consistent with the historical context that this area once experienced ancient tropical flora. However, there were more temperate plant genera (58.45%) than tropical ones (41.55%). In addition, 623 endemic species (38.53% of total plants) were found, which were also located in the surrounding areas, reflecting east-west intersection trends. The floristic elements of the seed plants in Xingdoushan were not only complex and varied, but also exhibited transition zone distribution. Ancient relic features were also found, with certain plants showing good native community distribution. There were a considerable number of endemic, rare, and endangered plants, which exhibited important protection value.