木犀属内分组关系的分类修订

An infrageneric taxonomic revision of the genus Osmanthus

【目的】以桂花为代表的木犀属植物种具有很高的经济和研究价值。然而,由于种间缺乏明显的形态特征,该属内的种间关系一直存在争议,因此亟须对属内的分组关系进行分类修订。【方法】整合了形态特征、分子系统发育的多重证据对属内的组级分类单位进行界定,并利用分类学原理和命名法规进行分类处理。【结果】将木犀属划分为4个主要分支,即保留木犀组和管花木犀组,将美丽木犀分支独立成组,将野桂花和短丝木犀分支独立成组,将离瓣木犀组归并至木犀组。4个分支在形态特征、系统发育、地理分布上均获得强有力的支持。【结论】新修订保证了各组在系统发育关系上的单系性以及形态上的特异性,使得植物种间关系更符合系统演化证据,为今后的科学研究以及资源保护利用提供重要参考。

【Objective】The genus Osmanthus Lour.species represented by sweet osmanthus has high economic and research values.However,species relationships within the genus have been controversial due to the lack of distinct morphological characters among species,and there is an urgent need for a taxonomic revision of the sectional relationships within the genus.【Method】This study integrates multiple lines of evidence from morphological characters and molecular phylogeny to define section-level taxonomic units within the genus.Taxonomic treatments were provided based on taxonomic principles and nomenclatural codes.【Result】Here we propose to divide the genus Osmanthus into four sections,first retaining O.sect.Osmanthus and O.sect.Siphosmanthus Franch.;secondly,creating a new section with O.decorus(Boiss.&Balansa)Kasapligil;then creating a new section with O.yunnanensis(Franch.)P.S.Green and O.serrulatus Rehder;and finally,merging O.sect.linocieroides P.S.Green into O.sect.Osmanthus.These four sections are all strongly supported morphologically,phylogenetically and geographically.【Conclusion】The new revision ensures the phylogenetic relationships of each group are monophyletic and morphologically specific,which makes the species relationships more consistent with the evidence of systematic evolution,and provides an important reference for future scientific research and resource conservation and utilization.