Nasturtium officinale W.T.Aiton , it is an aquatic perennial, up to 10-80 cm long, procumbent or floating, branches glabrous, green, sometimes with scattered simple hairs. Leaves with (1-) 5-9 leaflets, the terminal leaflet always larger and ± orbicular. Flowers c. 5 mm across, white, in corymbose racemes, becoming slightly lax in fruits. Sepals c. 2 mm long. Petals 4-5 (-6) mm long. Anthers short, c. 1 mm long, on simple filaments. Pedicels 5-10 (-15) mm long in fruit spreading. Siliquac 10-20 x 2-2.5 mm, sub cylindrical, often slightly up curved, glabrous, many seeded. Seeds ± 2-seriate, ovoid, c. 1 mm long with c. 25 polygonal depressions on each face.
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