Rorippa(Cruciferae, Arabideae) in New Zealand

Abstract
Rorippa amphibia and R. sylvestris have been introduced to New Zealand. R. palustris, formerly misiden.tified as R. islandica, is probably native. R. stylosa (DC.) Allan is an illegitimate name and is replaced by the .new combmation R. gigantea (Hook.f.) Garnock-Jones. A key and distribution maps are provided for the four species of Rorippa in New Zealand.