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To scientifically solve the taxonomical confusion of Yulania sprengeri (Pamp.) D. L. Fu in the world, the chloroplast genomic sequences of four confusable species were assembled and compared with the other species of Yulania Spach by means of the typical algorithm. The results indicated that the evolutionary system of Yulania Spach includes four natural sections: Y. sect. Yulania, Y. sect. Buergeria (Sieb. & Zucc.) D. L. Fu, Y. sect. Rosula D. L. Fu, sect., nov., and Y. sect. Tulipastrum (Spach) D. L. Fu, which all have the same boundaries: PHS (17bp) = 0.96. The species Y. sprengeri (Pamp.) D. L. Fu belong to sect. Yulania, but several confusable species such as Y. diva (Stapf. ex Dandy) D. L. Fu, sp. transl. nov., Y. urceolata D. L. Fu, B. H. Xiong et X. Chen, sp. segregat. nov., Y. pendula D. L. Fu, sp. nov. and Y. viridula D. L. Fu, T. B. Zhao et G. H. Tian belong to the new section Rosula D. L. Fu. According to International Code of Botanical Nomenclature, Y. sprengeri (Pamp.) D. L. Fu is proposed for conservation and emended with the conserved type (D. L. Fu 2017100803, CAF). The misidentified epitype of Magnolia sprengeri, the illustration in Flora of Trees of China, differing taxonomically, selected as Lectotype, with almost equal specimen, paratype (D. L. Fu 2017093001, CAF) from Weining County, Guizhou province of China, was segregated as a new species, Y. urceolata D. L. Fu, B. H. Xiong et X. Chen. The other new confusable species, Y. pendula D. L. Fu, is described and illustrated based on the holotype (D. L. Fu 2012040201, CAF) from Sichuan province of China, which was once misidentified as Y. biondii (Pamp.) D. L. Fu or Y. sprengeri (Pamp.) D. L. Fu. The typci-evolutionary characters including diagnostic differences and particularity of the new section and two new species, are given respectively. The evolutionary system scientifically overcomes the partiality and subjectivity of past taxonomical systems of Yulania Spach of Magnoliaceae Juss. |
