INTRODUCTION
Nasturatium R.Br is a genus of Brassicaceae (Syn: Cruciferae or Mustard family) and belongs to Tribe: Arabideae (Koch, 2001; Franzke, 2011). Al-Shehbaz was pointed in 1988 that this genus named firstly by Brow in 1812. There are multiple opinions about the location of Nasturatium which has raised controversy and debate about the survival of an independent as a genus or incorporated into the genus Roripa, Some researchers favor the survival of Nasturitum separately as a genus like (Czerepanov, 1995; Mabberley, 1997) and others from the separation Nasturtium about genus Roripa on the basis of sequence Chloroplast DNA (rbcL) and explained that Nasturitum unrelated document Cardamine L. likes of Les (1994) and some of them have a different opinion on that integrates this genus with Roripa (Jonsell, 1988; Rich, 1991; Rollins, 1993).
There are five species in this genus like N.officinale R.B, N.microphyllum Boenn.ex Reich, N.gambellii, O.E.Schulz, N.africanum Braun-Blanq and N.floridanum (AL-Shehbaz and Rollins, 1988). In Iraq, there is only one species, a Nasturtium officinale (Ridda, and Daood, 1982; Al-Shehbaz and Rollins, 1988) although AL-Rawi (1964), reported the presence of two species, the first was described previously under named Nasturtium officinale and the second is N.amphibium (L.) R.Br. Synonym of Roripa amphilia (L.) Bess. and it spreads within the Sulaimaniya province. The name of Nasturtium officinale derives from the Latin language nasus tortus which mean twisted nose relative to the form of fruits. As the common names are Water cress (Goncalvesa, 2009; Bettega, 2016), watercress, KUZELE, KUZAKUZ, KOBANI, HURF AL-MA’I and RASHAD AL-MA’I (Hedge and Lamond, 1980). Sheridan (2001), stated that synonyms names for this genus are Rorippa nasturtium-aquaticum (L.) Hayek; Nasturtium nasturtium-aquaticum (L.) H. Karst and Sisybrium nasturtium-aquaticum L.