Water Hyacinth(Eichhornia Crassipes) is a free floating aquatic macrophyte found every where in India. Water Hyacinth shows hydrophytic adaptations like reduced epidermis, lacking cutical and have a large air-space. Presence of rafied crystals is found in the parenchyma cells. The most important anatomical feature found is the presence of gas -filled chambers. These air chambers give buyancy to the organism. The aeranchyma cells are prominent in the anatomy.