Plant Systematics and Evolution

, Volume 170, Issue 1–2, pp 71–84 | Cite as

Distribution of diploid sexual plants ofTaraxacum sect.Ruderalia in east-Central Europe, with special reference to Czechoslovakia

  • J. C. M. den Nijs
  • J. Kirschner
  • J. Štěpánek
  • A. van der Hulst
Article

Abstract

Herbarium specimens (c. 1 000) and population samples (76) have been screened for the occurrence of diploid representatives ofTaraxacum sect.Ruderalia (T. sect.Vulgaria, nom. illeg.). The area studied comprises German Democratic Republic, Poland, Czechoslovakia, Hungary and parts of Austria, Yugoslavia, and Rumania. Diploids are common from the Valley of the Moravia river on southwards. Isolated outpost localities are found in S. Poland and extend far to the north: neighbourhood of Berlin. Based on the pattern of distribution in Czechoslovakia, the Pannonian (thermophilous) phytogeographical character of the diploids is discussed. Special attention has been paid to morphological differences between di- and triploids in Czechoslovakia. The study provides a basis for further biosystematical and taxonomic studies in the relationships between diploids and polyploids as well as in the stability of agamospecies.

Key words

Angiosperms Asteraceae Taraxacum sect.Ruderalia Sexual diploids mixed populations distribution pattern ecogeographical relations taxonomical problems 

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • J. C. M. den Nijs
    • 1
  • J. Kirschner
    • 2
  • J. Štěpánek
    • 2
  • A. van der Hulst
    • 1
  1. 1.Hugo de Vries Laboratorium, Department of Evolutionary BotanyUniversity of AmsterdamAmsterdamThe Netherlands
  2. 2.Department of Biosystematics, Institute of BotanyCzechoslovak Academy of SciencesPrůhoniceCzechoslovakia

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