Look up: Ludwigia

1. 
   Ludwigia
   (Primrose Creeper, Primrose Willow) These tropical, aquatic plants are found wild in South America. L. palustris, the Primrose Creeper, carpets the edges of ponds with creeping or floating, branching stems, which grow up to a foot high, covered with glossy, oval leaves, which grow up to an inch in length. The leaves are light green on top and creamy green beneath. The foliage that grows above the water may be darker green tinted with red. It produces cup-shaped, yellow flowers. This plant is ex...
   Found on http://www.botany.com/ludwigia.html
   
   
2. 
   Ludwigia
   `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. ;Selected species 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 ...
   Found on http://en.wikipedia.org/wiki/Ludwigia
   
   
3. 
   Ludwigia
   (from the article `Onagraceae`) In wet places, especially in warmer parts of both the Old and New worlds, is another large day-blooming genus, Ludwigia, 75 species of water and ... ...which form a tangled jungle, even after the main roots and stem bases of the trees have decayed. In the Onagraceae family, a similar adaptation to ... ...
   Found on http://www.britannica.com/eb/a-z/l/81