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Bulletin of Botanical Research ›› 2022, Vol. 42 ›› Issue (4): 536-543.doi: 10.7525/j.issn.1673-5102.2022.04.003

• Systematic and Evolutionary • Previous Articles     Next Articles

Numerical Taxonomy on Saxifraga diversifolia Complex(Saxifragaceae)

Xiaolei MA1,2, Liukun JIA2,3, Qian CAO1,2, Shilong CHEN1, Qingbo GAO1()   

  1. 1.Key Laboratory of Crop Molecular Breeding of Qinghai Province,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810001
    2.University of Chinese Academy of Sciences,Beijing 100049
    3.Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201
  • Received:2021-06-10 Online:2022-07-20 Published:2022-07-15
  • Contact: Qingbo GAO E-mail:qbgao@nwipb.cas.cn
  • About author:MA Xiaolei(1997—),male,postgraduate,major in plant adaption and evolution in the Qinghai-Tibet Plateau.
  • Supported by:
    Applied Basic Research Project of Qinghai Province(2019-ZJ-7019);Qinghai High-End Innovative Talents Thousands of People Plan


Saxifraga sect. Ciliatae Haworth belonging to Saxifraga Tourn. ex L. has highly species richness, but phylogenetic relationships within the section have not been well resolved. S. subsect. Hirculoideae Engl. is the largest subsection in sect. Ciliatae, which is mainly distributed in the Qinghai-Tibet Plateau and its surrounding areas. Based on the morphological characteristics, the subsect. of Hirculoideae was divided into three complex group, and the species attaching to the bumped vein at the leaf submarginal was classified to the S. diversifolia complex. Based on specimen inspection, the morphological and distributional data of 657 specimens from 24 species and two varieties were obtained, and 24 morphological characteristics of each specimen were used for principal component analysis and cluster analysis respectively. A total of 443 geographical distribution records was used to construct the distribution pattern of complex group. The cumulative contribution rate of the first seven principal components with an eigenvalues greater than one was low, only 67.748%. Among the characters of ‘cauline leaves petiolate’, ‘proximal median cauline leaves shape’, ‘inflorescence’, ‘proximal median cauline leaves size’, ‘sepal veins confluent at apex’, and ‘base of leaves cordate’, the contribution value of the first three principal components was large 0.6, could be used as the key characters for classification and identification of S. diversifolia complex. Based on morphological clustering and geographical distribution patterns, S. diversifolia complex could be divided into three branches: Himalayan Branch, Mountains Around Sichuan Basin Branch and Hengduan Mountains Branch(Contained a widespread species: S. egregia), and the result was also supported by PCA.

Key words: Saxifraga diversifolia complex, numerical taxonomy, morphology, distribution

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