Plant Systematics and Evolution

, Volume 212, Issue 1–2, pp 31–51 | Cite as

Relationships among species inCarex sect.Phyllostachys (Cyperaceae) based on allozyme divergence

  • Bruce A. Ford
  • Julian R. Starr
  • D. A. Ross McQueen
  • Robert F. C. Naczi


Allozyme variation was examined inCarex sect.Phyllostachys (Cyperaceae) to provide insight into phylogenetic relationships hypothesized in an earlier study and to determine the degree of genetic differentiation within and between taxa. Genetic identity values are concordant with the morphological differences found between species. The lowest values are found between species with the greatest morphological dissimilarity. Conversely, the highest values are associated with species pairs distinguished by relatively few morphological differences. Conspecific populations possess high genetic identities, although interpopulation differentiation has characterized the evolutionary history of some species. Geographic patterning is also evident within species, with geographically proximate populations often having the highest identity values. Phylogenetic trees produced using different cladistic methods were poorly supported and varied in their depiction of relationships among species. One cladogram produced using presence/absence allelic data is more or less congruent with a topology recovered from an earlier analysis utilizing molecular and morphological data. The wide- and narrow-scaled clades are maintained as are the sister species pairsC. backii/C. saximontana, C. basiantha/C. superata, andC. jamesii/C. juniperorum. Contrary to the finding of our previous study, however,C. willdenowii is aligned withC. jamesii/C. juniperorum.

Key words

Cyperaceae Carex Allozyme divergence phylogenetic relationships species delimitation 


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Copyright information

© Springer-Verlag 1998

Authors and Affiliations

  • Bruce A. Ford
    • 1
  • Julian R. Starr
    • 1
  • D. A. Ross McQueen
    • 1
  • Robert F. C. Naczi
    • 2
  1. 1.Department of BotanyUniversity of ManitobaWinnipegCanada
  2. 2.Department of Biological SciencesNorthern Kentucky UniversityHighland HeightsUSA

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