中国柳属两个新记录种OA

This study presents the first confirmed records of two willow species,Salix sericeo-cinerea Nakai and S.udensis Trautv.& C.Meyer in China,based on an integrative approach combining extensive field investigations of Salix L.plant populations in the Northeast China,combined with indepth research on related taxonomc literature both domestically and internationally,as well as comparisons of speciemens from multiple herbarium collections.The research was conducted to clarify the taxonomic status,morphological characteristics,and geographical distribution of these previously undocumented species in China.Materials and methods involved:(1)Systematic field surveys across Northeast China(2021-2024),with particular emphasis on population-level morphological variations during both flowering and vegetative stages;(2)Exhaustive analysis of taxonomic literature,including original descriptions and regional floras;(3)Detailed comparisons of a substantial number of herbarium specimens,including type materials accessed through international collaborations and digital repositories.S.sericeo-cinerea,distributed in Fenghuang Mountain,Wuchang City,Heilongjiang Province,was identified as an alpine dwarf shrub(0.5-1.8 m tall)characterized by obovate leaves with margins conspicuously adorned by white silky villous hairs,catkins bearing 4-8 small basal leaves,and remarkably prominent styles.These diagnostic features provided clear distinctions from its morphologically similar congener,S.taraikensis Kimura.S.udensis,found in Xingkai Lake,Heilongjiang Province,and Northeastern Inner Mongolia,was recognized as a medium-sized shrub(3-5 m tall)with narrowly obovate leaves and uniquely deeply cleft stigmas(extending below the midpoint of the styles),providing reliable diagnostic characters to separate it from the widespread S.sachalinensis F.Schmidt.Population-level morphohegical stability stuies further validated the species-level taxonomic status of these two taxa.Comprehensive morphological descriptions were provided,supported by detailed morphological illustrations and voucher specimens(deposited at BJFC),along with precise geographical distribution data.Ecological observations revealed that S.sericeo-cinerea predominantly grows in high-altitude open slopes(1 400-1 700 m),while S.udensis occured in lowland wetland habitats near the China-Russia border region.This study unequivocally confirms the existence of S.sericeo-cinerea and S.udensis in China,representing significant additions to the diversity of Salix in the country.The findings highlight the importance of thorough taxonomic revisions and targeted field surveys in understudied regions.Moreover,the research establishes a solid foundation for future studies on the phylogeny,biogeography,and conservation of these newly recorded species in Northeast China.The methodological framework employed,particularly the integration of population-level analyses with type specimen examinations,provides a valuable model for resolving complex taxonomic issues in Salix and other challenging plant groups.