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Article
Published: 2015-06-25

Taxonomic reexamination of Portulaca boninensis (Portulacaceae) in the Bonin (Ogasawara) Islands of Japan using molecular and morphological data

Department of Botany, National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan Graduate School of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan.
Makino Herbarium, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo. 192-0397, Japan.
Laboratory of Phytogeography and Applied Geobotany, Department PDTA, Section Environment and Landscape, University of Rome Sapienza, 00196 Rome, Italy.
Department of Botany, National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan Graduate School of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan.
Department of Botany, National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan Graduate School of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan.
Biodiversity Research Center, Academia Sinica, Nangang, Taipei 115, Taiwan. Botanic Garden, Field Science Center for Northern Biosphere, Hokkaido University, Chuo-ku, Sapporo 060-0003, Japan
Makino Herbarium, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo. 192-0397, Japan.
Laboratory of Ecology and Systematics, Faculty of Science, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan.
Biogeography ITS lectotype Philippines Portulaca psammotropha Taiwan Taxonomic revision Magnoliids Japan

Abstract

Molecular phylogenetic analyses, morphological observations, and nomenclatural studies were carried out to investigate the taxonomic status of Portulaca boninensis, endemic species from the Bonin (Ogasawara) Islands (Japan). The results addressed controversy between the widely naturalized P. boninensis and P. pilosa, indicating that they are phylogenetically and morphologically distinct. Furthermore, P. boninensis was showed to be conspecific to P. psammotropha which is until now recorded in southern China, Taiwan, and the northern Philippines, but not in the Ryukyus. The name of P. psammotropha was lectotypified on a specimen preserved at K. Based on phylogeography, P. psammotropha likely migrated to the Oceanic Bonin Islands oversea by sea-current dispersal or by exo- and/or end ozoochory through migratory birds without passing through Ryukyus.