Species: Rorippa nasturtium-aquaticum

Plantae - Anthophyta - Dicotyledoneae - Capparales - Brassicaceae - Rorippa - Treated as Rorippa nasturtium-aquaticum by Kartesz (1994 checklist and 1999 floristic synthesis); sometimes treated instead as Nasturtium officinale. As treated by Kartesz (1999), excludes as R. microphylla the plants sometimes treated as R. nasturtium-aquaticum var. longisiliqua, and excludes as R. x sterilis the plants sometimes called R. nasturtium-aquaticum var. sterilis. Generally acknowledged to be Eurasian, but considered native at one Alaskan site as well (cf. Hulten, Kartesz). For the Great Lakes region, Voss (Flora of Michigan) notes that early explorers, proceeding by canoe, did not find this plant, although it is now widely established.