Brazilian Waterweed (Egeria densa) Brazilian Waterweed. Robert Johnson, Cornell University. Ruthanna Hawkins, Cayuga Lake Watershed Network. Used with permission. Brazilian Waterweed Drawing, University of Florida, Center for Aquatic and Invasive Plants Line Drawing DVD Master. Used with permission. Plant Characteristics Lance-shaped leaves arranged in whorls around the stem. 4 to 6 leaves per whorl Whorls of leaves are typically closer together or denser than those of the American elodea Leaves feel smooth Small serrations along the leaf margin are difficult to see with the naked eye Can be found in both still and flowing waters of lakes, ponds, small streams and ditches Back Page updated on August 15, 2005.