Alisma plantago-aquatica L., it is a perennial or helophyte, aquatic herb. Peduncle (2-) 6-10 cm high. Inflorescence of about 6 whorls of branches and flowers; bracts membranous, lanceolate, those of the lowest whorl 1-2 × 0.5 cm., with several smaller bracteoles. Pedicels up to 2 cm. long. Sepals ovate, 2 mm. long. Stamens 2 mm, long; anthers 0.75 mm. long, narrow; filaments attached above the base. Petals 4 mm. long, white, delicate. Achenes broadly ovate, with 2 or 3 ridges on the dorsal surface, pale brown to yellowish. Carpels ovate, compressed, less than 1 mm long; style about 1 mm long, erect or slightly curved.
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