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Floating Water-plantain : ウィキペディア英語版 | Luronium
''Luronium natans'' is a species of aquatic plant commonly known as the floating water-plantain. It is the only recognized species in the genus ''Luronium'', native to much of Europe, from Spain to Britain to Norway east to Ukraine.〔(Kew World Checklist of Selected Plant Families )〕〔(Altervista Flora Italiana, Mestolaccia natante, Floating Water Plantain )〕 ==Description== Stems elongated, rising in the water or creeping and rooting at the nodes. Submerged leaves (if present) basal, linear; floating or aerial leaves elliptical to ovate. Flowers hermaphrodite, long-pedunculate in the axils of the floating or aerial leaves. Stamens 6. Carpels 6–15 in an irregular whorl, free, each with 1 ovule; styles apical. Fruitlets achenial, longitudinally many-ribbed, with a short apical beak. 2''n'' = 42.〔〔(Rafinesque, Constantine Samuel. 1840. Autikon Botanikon 63 ).〕〔(Joint Nature Conservancy Committee, 1831 Floating water-plantain, ''Luronium natans'' )〕〔(''Luronium natans'', National Museum of Wales )〕
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