The botanical magazine = Shokubutsu-gaku-zasshi

, Volume 103, Issue 4, pp 449–459 | Cite as

Allozyme diversity and the evolution ofCrepidiastrum (Compositae) on the Bonin (Ogasawara) Islands

  • Motomi Ito
  • Mikio Ono


The genusCrepidiastrum is distributed in East Asia and includes 7 species. In the Bonin Islands, three species ofCrepidiastrum occur, and all of them are endemic to the islands. For detecting the origin and speciation of these endemic species, electrophoretic studies have been done in three endemic species of the Bonin Islands as well as in the remaining four species ofCrepidiastrum, andYoungia denticulata which is considered to be closely related toCrepidiastrum.

A total of 386 individuals were sampled from 14 populations. As a result, 17 loci of 10 enzyme systems were resolved and gene frequencies for each population were calculated. The genetic variability was low in island species, as reported in some oceanic island plants. Four groups were recognized in the dendrogram generated by the UPGMA method. The Bonin endemics were clustered together, suggesting a monophyletic origin.C. ameristophyllum andC. linguaefolium were found to be genetically very similar, and this may suggest recent and rapid speciation within the islands.

Key words

Allozyme diversity Bonin Islands Crepidiastrum Oceanic island Youngia 


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Copyright information

© The Botanical Society of Japan 1990

Authors and Affiliations

  • Motomi Ito
    • 1
  • Mikio Ono
    • 1
  1. 1.Makino HerbariumTokyo Metropolitan UniversityTokyo

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