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Eichhornia crassipes.jpg
Eichhornia crassipes
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
(unranked): Commelinids
Order: Commelinales
Family: Pontederiaceae

See text

Pontederiaceae is a family of flowering plants.

The APG II system, of 2003 (unchanged from the APG system, of 1998) places the family in the order Commelinales, in the commelinid clade, in the monocots. It is a small family of heterostylous aquatic plants, occurring in tropical and subtropical 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 six genera with a total of 34 known species.[2]

It is best known for the water hyacinth (Eichhornia crassipes), which is an invasive species in many waterways. The highly modified Hydrothrix gardneri is a submerged aquatic with a two-flowered pseudanthium.


There are 9 genera within this family as below.


  1. ^ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 2013-06-26. 
  2. ^ Christenhusz, M. J. M. & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. Magnolia Press. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1. 

External links[edit]

Media related to Pontederiaceae at Wikimedia Commons Data related to Pontederiaceae at Wikispecies