
A helophyte is a plant that grows in marsh, partly submerged in water, so that it regrows from buds below the water surface. Fringing stands of tall vegetation by water basins and rivers may include helophytes. Examples include stands of Equisetum fluviatile, Glyceria maxima, Hippuris vulgaris, Sagittaria, Carex, Schoenoplectus, Sparganium, Acorus...
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http://en.wikipedia.org/wiki/Helophyte

helophyte 1. A perennial plant with renewal buds, commonly on rhizomes, buried in soil or mud below water level. 2. Any marsh or bog plant.
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http://www.wordinfo.info/words/index/info/view_unit/2756/
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