This perennial has floating rosettes of leaves, issuing rope-like shoots of 15-40 cm in length, which develop daughter rosettes, parting from the mother plant when twigs are torn or rotten. The leaves are finely serrate on the edges. It is a dioecious plant: the flowers are unisexual, about 2.5 cm across – long-stalked staminate and sessile pistillate.
It is very widespread and numerous in lakes, bayous, ponds and bogs. It flowers June to August.
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