funded by the Biodiversity Survey and Assessment Project of the Ministry of Ecology and Environment,China(2019HJ2096001006);the Shanghai Municipal Administration of Forestation and City Appearance(grant number G192421);the Biological Resource ProgrammeCAS(ZSZY-001-8);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13020603);the Basic Project of Ministry of Science and Technology of China under Grant(2015FY110200).
Understanding how natural hybridization and polyploidizations originate in plants requires identifying potential diploid ancestors.However,cryptic plant species are widespread,particularly in Ceratopteris(Pteridaceae)...