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
Broad stipules present. Leaves 2–7 cm long. Salt water plants (Halophila) Hydrocharitaceae
Leaves prominently sharply toothed so as to appear almost pinnatifid, 12–15 mm long, c. 5 mm wide, dilated at the base into a short sheath without auricles. Carpels mostly with 3 stigmas. Dioecious annual. Coast. Lagoons, in fresh to slightly brackish water. Fl. spring–autumn Najas marinalatior
Leaves inconspicuously toothed, with auriculate sheaths, up to 5 cm long, 1–3 mm wide. Carpels with 2 or 3 stigmas