1998) is a family of marine perennial flowering plants found in temperate and subtropical coastal waters, with the highest diversity located around Korea and Japan.

Most seagrasses complete their entire life cycle under water,[3] having filamentous pollen especially adapted to dispersion in an aquatic environment and ribbon-like leaves that lack stomata.

The APG II system of 2003 recognizes this family and places it in the monocot order Alismatales.

Marine grasses families: Zosteraceae, Cymodoceaceae, Ruppiaceae and Posidoniaceae.

Waycott, M, McMahon, K, Lavery, P 2014, A Guide to Southern Temperate Seagrasses, CSIRO Publishing, Melbourne, ISBN 9781486300150