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annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities

: an annual or biennial cress (Rorippa islandica) that grows in damp places, is a troublesome weed in some localities, and has leaves which are sometimes used in salads or as a potherb — called also yellow water cress

any cress belonging to the genus Rorippa, of the mustard family, esp. R. islandica, that grows in marshy areas in North America and Eurasia.

marsh cress,

a North American plant of the mustard family that grows in moist places.