Plant Systematics and Evolution

, Volume 224, Issue 1–2, pp 13–32

Intercontinental dispersal: The origin of the widespread South American plant speciesGilia laciniata (Polemoniaceae) from a rare California and Oregon coastal endemic

  • P. L. Morrell
  • J. M. Porter
  • E. A. Friar
Article

Abstract

Although separated by 7000-km,Gilia millefoliata, a rare annual plant from California and Oregon coastal dunes andG. valdiviensis, a rare Chilean coastal endemic are morphologically and ecologically quite similar. Their disjunct distribution was proposed to result from recent, birdmediated, intercontinental long-distance dispersal. Both species are morphologically similar to the abundant and ecologically diverse South American taxonG. laciniata. The relationship among these three taxa was investigated using DNA sequence from the nuclear ribosomal (ITS) and chloroplasttrnL regions, as well as isozyme and morphological variation to determine the roles of long-distance dispersal and ecological adaptation in the evolution of the group. These data suggest that aG. millefoliata-like ancestor underwent long-distance dispersal to South America, and there gave rise to the narrow endemicG. valdiviensis and the widespreadG. laciniata.

Key words

Polemoniaceae Gilia millefoliata Gilia laciniata Long-distance dispersal Baker's Rule ITS sequence 

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • P. L. Morrell
    • 1
  • J. M. Porter
    • 1
  • E. A. Friar
    • 1
  1. 1.Rancho Santa Ana Botanic GardenClaremontUSA
  2. 2.Plant Genome Mapping Laboratory, Department of Crop and Soil ScienceUniversity of GeorgiaAthensUSA

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