Ludwigia (primrose-willow, water-purslane, or water-primrose) is a genus of about 75 species of aquatic plants with a cosmopolitan but mainly tropical distribution. (aka Mexican Primrose-willow)
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.
As noted, the debate regarding its taxonimical data also adds to the complex issue of obtaining other more observational data such as habitat, distribution etc.
This one was captured in a rural area 50 kms east of Bogotá at an altitude of approx. 2000 M., Colombia, South America.