Dioecism of the genusCallicarpa (Verbenaceae) in the Bonin (Ogasawara) Islands |
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Authors: | Nobumitsu Kawakubo |
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Institution: | (1) Department of Biology, Faculty of Science, Kagoshima University, Kohrimoto, 890 Kagoshima |
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Abstract: | The morphology and function of the flowers of three species of the genusCallicarpa, C. glabra, C. nisnimurae andC. subpubescens, endemic to the Bonin Islands, revealed that all three species were dioecious. Male plants had short-styled flowers with
sterile ovaries, while female plants had long-styled flowers with non-germinating inaperturate pollen grains. Such dioecism
has never been reported from the family Verbenaceae. This curious sexual system with non-germinating pollen grains may have
been maintained as a reward to insect pollinators. |
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Keywords: | Bonin Islands Callicarpa Dioecy Inaperturate pollen grains Sex expression Staminate flower |
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