The family Pontederiaceae has nine genera including Eichhornia, which has eight species of freshwater aquatics including water hyacinth(Eichhornia crassipes) (Barrett, 1988). Only E.crassipesis regarded as a pan-tropical aquatic weed (OEPP/EPPO, 2008). The name water hyacinth refers to its aquatic habitat and the similarity of the flower color to that of the garden hyacinth (Parsons & Cuthbertson, 2001). Water hyacinth (WH), a free-floating macrophyte, live at the air-water interface and form two distinct canopies: leaf canopies comprising above-water structures and root canopies comprising below water structures. The English common names of the plant are waterhyacinth, water hyacinth, and water-hyacinth. Waterhyacinth is the standardized spelling adopted by the Weed Science Society of America to denote that it is not an aquatic relative of true “hyacinth” (Hyacinthus spp.) (Center et al., 2002). Synonyms areEichhornia crassipes (Mart. and Zucc.) Solms, Pontederia crassipes (Mart. and Zucc.), Piaropus crassipes (Mart. and Zucc.) Britton (Penfound & Earle, 1948). Water hyacinth is an erect, free-floating, stoloniferous, perennial herb (Center et al.,2002). The mature WH consist of roots, rhizomes, stolons, leaves, inflorescences and fruit clusters (Penfound & Earle, 1948) See figure 2.1.