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)
Either; leaves alternate on an elongated stem (sometimes opposite when subtending flowers); or, leaves tufted on a short stem or arising from a rhizome
Leaves compound finely dissected or lobed (sometimes linear and stem-clasping)
Leaves entire or with 1–2 lobes or minutely toothed