|1.||any of several perennial submerged marine plants of the genus Zostera, esp Z. marina, having grasslike leaves: family Zosteraceae|
|2.||another name for tape grass|
any of two different groups of ribbonlike aquatic plants. Vallisneria species (family Hydrocharitaceae), also called tape grass, are native to temperate and tropical waters; V. spiralis, often grown in aquariums, is a favourite food of wild ducks. (For its unusual pollination see Alismatales.)
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