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Pontederiaceae is a family of .
The APG IV system of 2016 (unchanged from the APG III system of 2009, the APG II system of 2003 and the APG system of 1998) places the family in the order Commelinales, in the commelinid clade, in the Monocotyledon. It is a small family of heterostyly , occurring in Tropics and Subtropics waters. Charles Darwin was interested in the specialized form of heterostyly found in the family, known as tristyly. Not all of the species are heterostylous. The family contains two genera with around 40 known species.
It is best known for the water hyacinth ( Pontederia crassipes), which is an invasive species in many waterways. The highly modified Heteranthera gardneri is a submerged aquatic with a two-flowered pseudanthium.
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