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''Damasonium'' is a genus of six species of flowering plants in the family Alismataceae, commonly known as starfruit and by the older name thrumwort. The genus has a subcosmopolitan but very patchy distribution.〔Germplasm Resources Information Network: (''Damasonium'' )〕〔Australian Plant Name Index: (''Damasonium'' )〕〔Flora of NW Europe: (''Damasonium'' )〕〔Flora of North America: (''Damasonium'' )〕 They are aquatic perennial herbaceous plants growing in shallow water or mud beside ponds. The leaves are all basal, floating, or aerial in plants on pond margins. The flowers are hermaphrodite, in one to many whorls, in umbels, racemes or panicles; they have six stamens, and six to nine carpels arranged in a whorl, connate at the base, each with two to many ventral ovules; The styles are terminal. The fruit is a whorl of follicles; the follicles are laterally compressed, stellately radiating, with a more or less elongated apical beak.〔〔 ==Species== There are at the present time (May 2014) six currently accepted species:〔(Kew World Checklist of Selected Plant Families )〕〔(Altervista Flora Italiana, Mestolaccia stellata, Starfruit, ''Damasonium'' )〕 *''Damasonium alisma'' Mill. (syn. ''D. stellatum'' Thuill.; ''D. polyspermum'' Cosson; ''D. constrictum'' Juz.). - Great Britain, France, Portugal, Spain, Italy, Greece, Russia, Ukraine, Moldova, Kazakhstan *''Damasonium bourgaei'' Coss. - Mediterranean Basin and India *''Damasonium californicum'' Torr. ex Benth. - western United States (Idaho, Oregon, Nevada, California, Montana, Washington State)〔(Biota of North America Program )〕 *''Damasonium constrictum'' Juz. -Kazakhstan and Altay region of Siberia *''Damasonium minus'' (R. Br.) Buchenau (syn. ''D. australe'' Salisb.). Australia. *''Damasonium polyspermum'' Coss. - Spain, France, Portugal, Greece, Sicily, Algeria, Libya, Morocco 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「Damasonium」の詳細全文を読む スポンサード リンク
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