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Podostemaceae (riverweed family) is a family in the order Malpighiales. It comprises about 50 genera and 250 species of more or less thalloid aquatic herbs. Riverweeds adhere to hard surfaces (generally rock) in rapids and waterfalls of rivers. They are found mostly in tropical and subtropical areas world-wide.〔(【引用サイトリンク】 title=Podostemales )〕 Many species are found in a very small geographic area (perhaps even just a single river or waterfall).〔(【引用サイトリンク】 title=Podostemaceae )〕 Riverweeds are submerged when water levels are high, but during the dry season they live a terrestrial existence, flowering at this time. Their root anatomy is specialized for the purpose of clinging to rocks, and in fact details of the root structure are one of the ways of classifying riverweeds. The Podostemaceae are related to the families Clusiaceae, Hypericaceae (the St. John's wort family, which is sometimes treated as a subfamily of Clusiaceae), and Bonnetiaceae.〔(【引用サイトリンク】 Malpighiales )〕 ==Genera== *''Angolaea'' *''Apinagia'' *''Butumia'' *''Castelnavia'' *''Ceratolacis'' *''Cipoia'' *''Cladopus'' *''Dalzellia'' *''Devillea'' *''Dicraeanthus'' *''Dicraeia'' *''Diplobryum'' *''Djinga'' *''Endocaulos'' *''Farmeria'' *''Griffithella'' *''Heterotristicha'' *''Hydrobryum'' *''Indotristicha'' *''Jenmaniella'' *''Ledermanniella'' *''Leiothylax'' *''Letestuella'' *''Lonchostephus'' *''Lophogyne'' *''Macarenia'' *''Macropodiella'' *''Malaccotristicha'' *''Marathrum'' *''Mniopsis'' *''Monostylis'' *''Mourera'' *''Oserya'' *''Paleodicraeia'' *''Podostemum'' *''Pohliella'' *''Polypleurella'' *''Polypleurum'' *''Rhyncholacis'' *''Saxicolella'' *''Sphaerothylax'' *''Stonesia'' *''Thelethylax'' *''Torrenticola'' *''Tristicha'' *''Tulasneantha'' *''Vanroyenella'' *''Weddellina'' *''Wettsteiniola'' *''Willisia'' *''Winklerella'' *''Zehnderia'' 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「Podostemaceae」の詳細全文を読む スポンサード リンク
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