Water celery : A very acrid herb (Ranunculus sceleratus) growing in ditches and wet places; -- called also cursed crowfoot.

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Taxonomy
Water celery, plant, aquatic plant, to Washington, species, water bodies, rhizomes, seeds, forage plant, The leaves, Vallisneria americana, THREAT, tapegrass, eastern North America, wildlife, waterfowl, invasive, tendencies.

Defination from the web:
Water celery, also known as tapegrass, is an aquatic plant, native to eastern North America. It was. originally introduced to Washington as a forage plant for wildlife. ... Water celery is eaten by waterfowl and does. not seem to have invasive tendencies, so is not currently ...