Ludwigia (primrose-willow, water-purslane, or water-primrose) is a genus of about 82 species of aquatic plants native to Central and South America with a cosmopolitan but mainly tropical distribution.
At current, there is much debate among botanists and plant taxonomists as to the classification of many Ludwigia species. Botanists from the US Department of Agriculture are currently doing genetic analyses on plants from the Western US and South America to better classify members of this genus.
- "Ludwigia (Ludwigia peruviana)". NSW Department of Primary Industries. Retrieved 2020-02-05.
Native to South America, from Mexico through to Chile.
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- Angiosperm Fruits and Seeds from the Middle Miocene of Jutland (Denmark) by Else Marie Friis, The Royal Danish Academy of Sciences and Letters 24:3, 1985
- NCBI taxonomy- Reviewed 2017-11-25
- Wagner, W. L., Hoch, P. C., & Raven, P. H. (2007). Revised classification of the Onagraceae. Systematic Botany Monographs, 83.
- Dressler, S.; Schmidt, M. & Zizka, G. (2014). "Ludwigia". African plants – a Photo Guide. Frankfurt/Main: Forschungsinstitut Senckenberg.