Rorippa nasturtium-aquaticum.© Jesús Prados.www.biodiversidadvirtual.org (PRADOS, J (2009)Rorippa nasturtium-aquaticum (L.) Hayek, 09-VI-2009) (Accessed 4/2014).

Rorippa nasturtium-aquaticum is a perennial aquatic herb, on wet mud, floating or submersed, rooting along stem. 

Leaves alternate, pinnately divided, 3-9 rounded segments, terminal segment much larger than laterals. 

Flowers white, to 0.5 cm wide, 4-parted; stalks to 1.5 cm long, blooming May-July. 

Fruit capsules linear, to 2.5 cm long, curving, beak 0.1 cm.; fruiting to Oct. 

Wetland status: OBL. 

Frequency in NYC: Very infrequent. 

Origin: Eurasia. 

Habitat: Streams, clear, quite water. 

Notes: The edible, commercially grown watercress.