Gene lineage analysis in populations of Helianthus niveus and H. petiolaris (Asteraceae)

S. M. Beckstrom-Sternberg, Loren H. Rieseberg, Khiem Doan

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Helianthus petiolaris and H. niveus are polytypic species which are morphologically distinct at the periphery of their ranges but intergrade in areas of sympatry. Helianthus niveus includes both annual and perennial members, whereas H. petiolaris is strictly annual. Chloroplast DNA and nuclear ribosomal DNA restriction site data were used to reconstruct the evolutionary history of populations of the two species. Cladistic analyses reveal the following: (1) neither species is monophyletic; (2) the annual habit is derived once in this complex; and (3) the region of morphological intergradation appears to be primary in origin. The significance of interbreeding versus common descent in defining species concepts is discussed in relation to the above cladistic analyses.

Original languageEnglish (US)
Pages (from-to)125-138
Number of pages14
JournalPlant Systematics and Evolution
Issue number3-4
StatePublished - Sep 1991


  • Angiosperms
  • Asteraceae
  • H. petiolaris
  • Helianthus niveus
  • Morphological intergradation
  • gene lineage analysis
  • plant taxonomy
  • restriction-site variation
  • speciation

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science


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