The Society for the Study of Phytogeography and Taxonomy
抄録
Chromosome numbers of Duchesnea（Rosaceae）of 2,133 sites in the area comprising eight prefectures in cen-tral Honshu were investigated. Diploid, triploid, heptaploid, octoploid and dodecaploid plants were observed. The triploid plant was found in only one site in Gifu Prefecture. Diploid and dodecaploid plants were very common. Heptaploid and octoploid plants which are believed to be natural hybrids between diploid and dodecaploid plants were variable in distribution depending on the areas, i.e., higher rate distribution of them in the Japan Sea side than those of the Pacific side. The reason of the high frequency of both heptaploid and octoploid plants in the Ja-pan Sea side may be the high rate emergence of hybrid achenes, however, the exact matter is obscure.
Cytogeography of Duchesnea（Rosaceae）in central Japan
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