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Genus :


Family :



Perennial, scapigerous, aquatic herbs, rootstocks tuberous or stoloniferous, covered with numerous root fibres. Leaves floating or submerged, oblong, membranous. Inflorescence of spikes, flowers bisexual on long scapes, young spike enclosed in conical sheath, deciduous. Perianth pink, white or pale blue, 1-3, segments equal or unequal or obsolete. Stamens 6 or more, filaments subulate, unequal,  persistent, anthers didynamous. Carpels 3-6, each with 2 or more ovules. Fruits of 3 or more follicles. Seeds erect, testa thick or thin, embryo straight.

Key to the species

Serial Key Reference
1a. Leaves all submerged, margins undulate A. appendiculatus
1b. Leaves all floating, margins entire 2
2a. Follicles smooth, 4-8- seeded A. natans
2b. Follicles echinate, 2- seeded A. echinatus