サキシマフヨウの花の形質と変異，特にフヨウとの比較において

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  • サキシマフヨウ ノ ハナ ノ ケイシツ ト ヘンイ トクニ フヨウ ト ノ ヒカク ニ オイテ

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Abstract

Floral characters and their variations of Hibiscus makinoi Jotani et H. Ohba were examined in comparison with H. mutabilis L. Hibiscus makinoi, distributed from the Ryukyu Islands to western Kyushu of Japan, has been confused with H . mutabilis which is widely cultivated and sometimes escaped in western Japan. Eight flo-ral characters ; petal length, petal width, style length, anther-anther distance, anther-stigma distance, number of anthers, number of episepals, episepal width, and potential number of seeds per fruit and dry seed weight were measured for 10 individuals of H . makinoi and for 7 individuals of H . mutabilis, respectively. The petal length and width, style length, anther-anther distance, anther-stigma distance, and number of stamens of H . makinoi were signficantly smaller, and the episepal width was wider than those of H . mutabilis. Floral vari-ations in color and form of H . makinoi might be due to its ruderal habitat and for pollinators.

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