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(詳細はpollination whereby pollen is distributed by the flow of waters, particularly in rivers and streams. Hydrophilous species fall into two categories: those that distribute their pollen to the surface of water, and those that distribute it beneath the surface. Surface pollination is more frequent,〔(【引用サイトリンク】title=Pollination )〕 and appears to be a transitional phase between wind pollination and true hydrophily. In these the pollen floats on the surface and reaches the stigmas of the female flowers as in ''Hydrilla'', ''Callitriche'', ''Ruppia'', ''Zostera'', ''Elodea''. In ''Vallisneria'' the male flowers become detached and float on the surface of the water; the anthers are thus brought in contact with the stigmas of the female flowers.〔 Surface hydrophily has been observed in several species of ''Potamogeton'' as well as some marine species. Species exhibiting true submerged hydrophily include ''Najas'', where the pollen grains are heavier than water, and sinking down are caught by the stigmas of the extremely simple female flowers,〔 ''Posidonia australis'' and ''Zostera marina''.〔Cox, P.A. (1988). Hydrophilous pollination. ''Annual Review of Ecology and Systematics''. 19(1): 261–279.〕 == References == * it:Impollinazione#Impollinazione idrogama 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrophily」の詳細全文を読む スポンサード リンク
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