ABSTRACT
Sterns floating on water surface, globose or obovate, entire, rather thick, flat, 3-6 mm long, up to 5 mm broad, green on upper surface, reddish or reddish-violet beneath, roots in clusters of 3-5. Shoot branching only on one side; lateral shoots soon separating from main plant. Inflorescence in lateral pocket at stem base, with 2 staminate and 1 pistillate flower. Fruit single-seeded.
