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Flora and distribution of vascular hygro-and hydrophytes were investigated from April to June, 1983 on the seven sampling sites along the estuary of Nagdong River. As the result, total 60 kinds of vascular plants are investigated, among them 13 kinds are aquatics; Rotala indica var, uliginosa, Mytiophyllum spicatum, Alisma canaliculatum, Vallisneria asiatica, Hydrilla verticillata, Potamogeton berchtoldii, P. crispus, Ruppia maritima, Phyllospadix iwatensis, Zostera marina, Juncus effusus, Phragmites communis, and Scirpus triqueter. Present hydrophytes are largely confined to the main-stream zone. The transition zone is poorly habitated by hydrophytes and considered for the distributional limits of submersed aquatic macrophyte. Marine hydrophyte populaitons are only confined to the estuary and coastal zone. However, long-term conditions of salinity gradient appear to be primarily responcible for the present flora and distribution.
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