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Zosteraceae (one of the four seagrasses families, Kubitzki ed. 1998) is a family of marine Perennial plant found in temperate and subtropical coastal waters, with the highest diversity located around Korea and Japan. Most complete their entire life cycle under water, having filamentous pollen especially adapted to dispersion in an aquatic environment and ribbon-like leaves that lack stomata. Seagrasses are Herbaceous plant and have prominent creeping . A distinctive characteristic of the family is the presence of characteristic retinacules, which are present in all species except members of Zostera subgenus Zostera.
Zosteraceae has long been accepted by taxonomists as monophyletic. The APG II system of 2003 recognizes this family and places it in the monocot order Alismatales. The family contains approximately twenty-two species divided between two genera, Phyllospadix and Zostera totalling 22 known species (Christenhusz & Byng 2016 ). Zostera contains three subgenera: Heterozostera (formerly considered a separate genus ), Zostera and Zosterella. Zosteraceae is closely related to Potamogetonaceae, a family of freshwater aquatics.
Zosteraceae is a conserved name.
| + Families and Genera crosses (Sea grasses) ! scope="col" | Kubitzki (ed. 1998Kubitzki (ed.) 1998. The families and genera of vascular plants, vol 4, Monocotyledons: Alismatanae and Commelinanae (except Gramineae). Springer-Verlag, Berlin.) ! scope="col" | Watson & Dallwitz (delta-intkey)Watson & Dallwitz. Zosteraceae. The families of flowering plants. http://delta-intkey.com/angio/www/zosterac.htm ! scope="col" | data.kew ! scope="col" | APWeb (mobot.org) Vascular Plant Families and Genera. List of Genera in Cymodoceaceae (accessed 2016-06-02) |
| Zostera L. (including Heterozostera den Hartog, Macrozostera Tomlinson & Posluzny, Nanozostera Tomlinson & Posluzny, Zosterella J. K. Small) | ||||
| (in Zostera) | ||||
| Phyllospadix J. D. Hooker | ||||
| (in Cymodocea) | ||||
| Halodule Endlicher | ||||
| Cymodocea König (including Amphibolis Agardh ?, Syringodium Kütz. ?, Thalassodendron den Hartog ?) | ||||
| (in Cymodocea) | ||||
| (in Cymodocea) | ||||
| Ruppia L. | ||||
| Posidonia König | ||||
| + Families and Genera crosses (Potamogetonaceae) ! scope="col" | Kubitzki (ed. 1998Kubitzki (ed.) 1998. The families and genera of vascular plants, vol 4, Monocotyledons: Alismatanae and Commelinanae (except Gramineae). Springer-Verlag, Berlin.) ! scope="col" | Watson & Dallwitz (delta-intkey)Watson & Dallwitz. Potamogetonaceae. The families of flowering plants. http://delta-intkey.com/angio/www/potamoge.htm ! scope="col" | data.kew ! scope="col" | APWeb (mobot.org) Vascular Plant Families and Genera. List of Genera in Potamogetonaceae (accessed 2016-06-02) |
| Potamogeton L. (including Coleogeton Les & Haynes, Stuckenia Börner) | ||||
| Groenlandia J. Gay | ||||
| (in Ruppia in Ruppiaceae) | ||||
| Althenia Petit (including Lepilaena Harvey) | ||||
| Pseudalthenia Nakai (including Vleisia Tomlinson & Posluszny) | ||||
| Zannichellia L. | ||||
| (in Zannichellia L.: Potamogetonaceae) | ||||
| (in Pseudalthenia: Potamogetonaceae) | ||||
| Althenia Petit (including Lepilaena Harvey) | ||||
| (in Althenia Petit) | ||||
| (in Pseudalthenia: Potamogetonaceae) | ||||
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