Potamogetonaceae
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 Potamogeton crispus
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Potamogetonaceae is a family of monocotyledonous flowering plants in the order Alismatales, with a cosmopolitan distribution.
The APG system (1998) and APG II system (2003) places it in the clade monocots. Their concept of the family includes the plants sometimes treated as family Zannichelliaceae, but to exclude the genus Ruppia. So circumscribed, the family consists of seven genera (notably Potamogeton), totalling about 90 species of perennial aquatic plants. Their leaf blades can be either floating or submersed, and their stems are often joined. The flowers are tetramerous: the floral formula (sepals; petals; stamens; carpels) is [4;0;4;4]. The plants have no petals. The fruit consists of 1-4 drupelets or achenes.
[edit] Genera
- Althenia
- Groenlandia
- Lepilaena
- Potamogeton
- Pseudalthenia
- Stuckenia
- Zannichellia
[edit] References
- Watson, L. & Dallwitz, M.J. (1992 onwards). Potamogetonaceae, Zannichelliaceae in The families of flowering plants
- Germplasm Resources Information Network: Potamogetonaceae
- Flora of North America: Potamogetonaceae, Zannichelliaceae
- NCBI Taxonomy Browser Potamogetonaceae
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