Vegetative key to the families
Vegetative Key Vegetative key to the families
Submerged plants rooted in mud. Leaves submerged or floating on the surface or sometimes the leaf blades held erect above the water surface. Freshwater or marine (Amphibious plants are not included in this group)
Leaves opposite or whorled on an elongated stem
Leaves entire or toothed or almost pinnatifid
Stipules small or absent. Fresh or brackish water plants
Stems creeping over the mud and rooting at the nodes; the plants forming mats. Leaves 3–15 mm long; minute stipules present Elatinaceae
Stems free in water. (Plant may root at the nodes). Stipules absent