Journal of Plant Research

, Volume 113, Issue 1, pp 79–89 | Cite as

Phylogeny and Phytogeography of Eupatorium (Eupatorieae, Asteraceae): Insights from Sequence Data of the nrDNA ITS Regions and cpDNA RFLP

  • Motomi Ito
  • Kuniaki Watanabe
  • Yoko Kita
  • Takayuki Kawahara
  • DJ Crawford
  • Tetsukazu Yahara

Eupatorium

were examined by sequencing the internal transcribed spacers (ITS) of nuclear ribosomal DNA and restriction site analysis of chloroplast DNA. Molecular data provided strong evidence that (1) this genus originated in North America, (2) the genus diverged into three morphological species groups, Eutrochium, Traganthes and Uncasia in North America, and (3) one of the North American Uncasia lineages migrated into temperate Europe and eastern Asia over the Bering land bridge. The estimated divergence times support a late Miocene to early Pliocene migration from North America to Eurasia via the Bering land bridge. A European species was sister to all of the eastern Asian species examined. The disjunct distribution pattern of the genus Eupatorium is incongruent with the classical Arcto-Tertiary geoflora concept.

Keywords: Arcto-Tertiary geoflora, Asteraceae, divergence time, Eupatorium, North American-Asian-European disjunction, phytogeography 

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Copyright information

© The Botanical Society of Japan 2000

Authors and Affiliations

  • Motomi Ito
    • 1
  • Kuniaki Watanabe
    • 2
  • Yoko Kita
    • 3
  • Takayuki Kawahara
    • 4
  • DJ Crawford
    • 5
  • Tetsukazu Yahara
    • 6
  1. 1.Department of Biology, Faculty of Science, Chiba University, Chiba, 263–8522 JapanJP
  2. 2.Department of Biology, Faculty of Science, Kobe University, Kobe, 657–8501 JapanJP
  3. 3.Department of Botany, Graduate School of Science, University of Tokyo, Tokyo, 113–0033 JapanJP
  4. 4.Hokkaido Research Center, Forestry and Forest Products Research Institute, Sapporo, 062–8516 JapanJP
  5. 5.Department of Plant Science, Ohio State University, Columbus, OH 43210 U.S.A.US
  6. 6.Department of Biology, Faculty of Science, Kyushu University, Fukuoka, 812–8581 JapanJP

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