Sagittaria
4 species naturalized Aust.; Qld, N.SW., Vic., S.A.
Tufted, aquatic herbs, usually perennial. Flowers unisexual, monoecious, in whorls; the males in the upper whorls; the females in the lower whorls. Stamens numerous. Carpels numerous, spirally arranged, compressed. Fruit an achene.