Zostera angustifolia is a marine plant with creeping underground stems.Parnell, J.P. and Curtis, T. 2012. Webb's An Irish Flora. Cork University Press.

Description This species is similar to Zostera marina. Its leaves are narrower and are about 25 cm long and no more than 3 mm wide. The sheaths form a tube around the stem. The branched inflorescence is about 10 cm long.

Ecology Estuaries and muddy areas at mid-tide and lower.

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