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''Trithuria'' is a genus of minute aquatic herbs. It is the only genus in the family Hydatellaceae, found in India, Australia, and New Zealand.〔(Kew World Checklist of Selected Plant Families )〕 In 2008, the genus ''Hydatella'' was subsumed into ''Trithuria''. In that paper, some species were merged and some new species were described, raising the number of species in ''Trithuria'' to 12. Eleven of the 12 species were formally described. The single species from India was not covered.〔Dmitry D. Sokoloff, Margarita V. Remizowa, Terry D. Macfarlane, and Paula J. Rudall. 2008. "Classification of the early-divergent angiosperm family Hydatellaceae: one genus instead of two, four new species and sexual dimorphism in dioecious taxa". ''Taxon'' 57(1):179-200.〕 These diminutive, moss-like, aquatic plants are the closest living relatives of the two closely related families Nymphaeaceae (water-lilies) and Cabombaceae. Together, these three families compose the order Nymphaeales in the APG III system of flowering plant classification. ''Trithuria'' (Hydatellaceae) diverged from the rest of Nymphaeales soon after Nymphaeales diverged from its sister taxon, which comprises all of the flowering plants except the two orders Nymphaeales and Amborellales. The placement of ''Trithuria'' in Nymphaeales was a surprise to some but this position is supported by ten morphological synapomorphies: * lack of a vascular cambium, * lack of pericyclic sclerenchyma, * anomocytic stomata, * truncate anther connective, * boat-shaped pollen, * inner integument with two cell layers, * palisade exotesta, * seed operculum formed by cell enlargement in the inner integument, * perisperm and * hypogeal germination. ;Species〔 # ''Trithuria austinensis'' D.D.Sokoloff - Western Australia # ''Trithuria australis'' (Diels) D.D.Sokoloff - Western Australia # ''Trithuria bibracteata'' Stapf ex D.A.Cooke - Western Australia # ''Trithuria cookeana'' D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall - Northern Territory of Australia # ''Trithuria cowieana'' D.D.Sokoloff - Northern Territory # ''Trithuria filamentosa'' Rodway - Tasmania # ''Trithuria inconspicua'' Cheeseman - North Island of New Zealand # ''Trithuria konkanensis'' S.R.Yadav & Janarth. - Maharashtra # ''Trithuria lanterna'' D.A.Cooke - Northern Territory, Western Australia, Queensland # ''Trithuria occidentalis'' Benth. - Western Australia # ''Trithuria polybracteata'' D.A.Cooke ex D.D.Sokoloff, Remizowa, T.D.Macfarl. & Rudall - Western Australia # ''Trithuria submersa'' Hook.f. - Western Australia, South Australia, Victoria, New South Wales, Tasmania ==References== 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「Trithuria」の詳細全文を読む スポンサード リンク
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