water lettuce - aquatic and wetland plants

aerenchyma aqua aquatic aqueous araceae arum basket being biology biota blue botanic botanical botany cabbage dampish dampy dense emergent feathery float floating flooding flora flow flowing fluid free green greenery hydric hydrophyte hydrophytic leaved lettuce like liquid lymph macrophyte margin mat moist monocotyledon natural nature nile organism parallel perennial pistia plantae plantes rosette shellflower specimen stratiotes structure submerged surface vegetal vein water wavy wetland