抄録
We examined the inter-island genetic variation and phylogenetic relationship in Malaxis boninensis and M. hahajimensis, endemic to the Bonin (Ogasawara) Islands, based on sequences of the matK, the trnL intron and trnL-trnF spacer region and the ITS region. The phylogenetic tree indicated that the two Bonin species are closely related to each other. In the two species, two haplotypes (northern and southern types) were recognized from the sequences of chloroplast DNA, but the ITS sequences were identical. The northern type was found in plants of M. boninensis from Chichi-jima ; the southern type was shared between plants of M. boninensis from Kita-Iwo-jima and M. hahajimensis, endemic to Haha-jima. Genetic as well as morphological variation should be considered in conservation measures to protect Malaxis in the Bonin Islands.
