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Studies on Chromosome Numbers and Anatomy of Young Branches of Calligonum of Xinjiang in Relation to the Evolution of Some Species of the Genus

Mao Zu-Mei, Yang Ge, Wang Chang-Gui   

  1.              (Xinjiang Institute of Biology, Pedology and Psammology, Academia sinica)
  • Received:1900-01-01 Revised:1900-01-01 Online:1983-02-18 Published:1983-02-18
  • Contact: Mao Zu-Mei

Abstract:

 There are more than 20 species of Calligonum in China, of which 17 are known
from Xinjiang.  They are divided into four sections.  This paper aims to study the
evolutionary relations of some species of Calligonum in Xinjiang.  The chromosome
numbers of 13 species and the anatomic structures of young branch of 8 species have
been examined.          
      Among 13 species, the, basic chromosome number x=9.9 species are diploids.  4
species are tetraploids.
      The evolutionary relations of these plants are arranged as follows:
     Section Calligonum (Fisch. et Mey.) Borszcz.     
           1.  C. junceum (Fisch. et Mey.) Litv.
      Section Pterococcus (Pall.) Borszcz.
           2.  C. leucocladum (Schrenk) Bge.
           3.  C. aphyllum (Pall.) Gürke.
           4.  C. rubicundum Bge.
      Section Calligonum
  ,.     5.  C. cordatum Eug. Kor.
           6.  C. densum Borszcz.    
           7.  C. klementzii A. Los.
      Section Medusa Sosk et Alexandra
           8.  C. mongolicum Turcz.     
           9.  C. pumilum A. Los.
          10.  C. ebi-nuricum Ivanova
          11.  C. arborescens Litv.
          12.  C. caput-medusae Schrenk
           13.C. roborovskii A. Los.

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