Nasturtium officinale R.Br., Brassicaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Radicula nasturtium Cav.; Rorippa nasturtium-aquaticum (L.) Hayek

Common name(s): [more details]

English: watercress

French: cresson, cresson d'eau, cresson de fontaine

Hawaiian: lēkō

Japanese: chisa, kawara-chisa, mizu-garashi, oranda-garashi

Spanish: berro, berro común, berro de agua, berros

Habit:  herb

Description:  "Herbs perennial, rhizomatous, aquatic, 10-70 (-200) cm tall, glabrous throughout or sparsely pubescent with simple trichomes. Stems decumbent or prostrate, erect in emergent plants, branched above, rooting at proximal nodes. Leaves all cauline, pinnately compound, 3-9 (-13)-foliolate; petiole auriculate at base; terminal leaflet suborbicular or oblong, 1-4 cm, base obtuse, cuneate, or subcordate, margin entire or repand, apex obtuse; lateral leaflets smaller, usually sessile. Fruiting pedicels slender, divaricate or recurved, 5-12 (-20) mm. Sepals oblong, 2-3.5 mm, lateral pair slightly saccate. Petals white or pink, spatulate or obovate, 2.8-4.5 (-6) x 1.5-25 mm, apex rounded; claw ca. 1 mm. Filaments white, 2-3.5 mm; anthers oblong, ca. 0.6 mm. Fruit cylindric, 1-1.5 (-2) cm x (1.8-) 2-2.5 (-3) mm; valves with an obscure midvein; style 0.5-1 (-1.5) mm. Seeds biseriate, ovoid, 1-1.3 x 0.7-1 mm, reddish brown, coarsely reticulate, with 25-50 (-60) areolae on each side"  (Flora of China online).

Habitat/ecology:  In New Caledonia, "Le cresson de fontaine, assez rarement naturalsé aux bords des ruisseaux à courant faible." (MacKee, 1994; p. 45).

Propagation:  Seed

Native range:  "Indigenous in Europe and western Asia, now cultivated and often naturalized in many other parts of the world" (Smith, 1981; pp. 709-710).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Chile (offshore islands) Juan Fernández Islands	Isla Más a Tierra (Robinson Crusoe Island)	introduced invasive	Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands) Juan Fernández Islands	Isla Más a Tierra (Robinson Crusoe Island)	introduced invasive	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557) As Rorippa nasturtium-aquaticum (L.) Hayek
Chile (offshore islands) Juan Fernández Islands	Isla Más Afuera (Alejandro Selkirk Island)	introduced invasive	Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands) Juan Fernández Islands	Isla Más Afuera (Alejandro Selkirk Island)	introduced invasive	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557) As Rorippa nasturtium-aquaticum (L.) Hayek
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced invasive cultivated	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	introduced invasive cultivated	Charles Darwin Foundation (2008)
Fiji Fiji Islands	Fiji Islands	introduced invasive cultivated	Smith, Albert C. (1981) (pp. 709-710) Infrequently naturalized.
French Polynesia Marquesas Islands	Hiva Oa Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
Guam Guam Island	Guam Island	introduced invasive cultivated	Stone, Benjamin C. (1970) (p. 288) Naturalized
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive cultivated	MacKee, H. S. (1994) (p. 45) Vouchers cited: Däniker 2864, MacKee 8077
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	possibly native	Peekel, P. G. [translated by E. E. Henty] (1984) (p. 194) Found only in the vicinity of settlements.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines Philippine Islands	Philippine Islands	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines Philippine Islands	Philippine Islands		Hafliger, Toni J./Wolf, Matthias (1988) (p. 186)
Philippines Philippine Islands	Philippine Islands	probably introduced invasive	Merrill, Elmer D. (1923) (p. 208) Abundant in shallow water and in small streams in Trinidad Valley, altitude about 1,300 m. Probably introduced since 1912.

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia Australia (continental)	Australia (continental)		Hafliger, Toni J./Wolf, Matthias (1988) (p. 186)
Australia Australia (continental)	Queensland	introduced invasive	Queensland Herbarium (2002) (p. 5)
Central America Central America (Pacific rim)	Guatemala (Republic of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Nicaragua (Republic of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
China China	China (People's Republic of)	introduced invasive cultivated	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) "Streams, ditches, lakes, swamps, marshes; near sea level to 3700 m".
Indonesia Indonesia	Indonesia (Republic of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia Indonesia	Indonesia (Republic of)		Hafliger, Toni J./Wolf, Matthias (1988) (p. 186)
Japan Japan	Japan	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan Japan	Japan		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 246)
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 183)
Malaysia Malaysia	Malaysia (country of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico Mexico	Mexico (United Mexican States)		Hafliger, Toni J./Wolf, Matthias (1988) (p. 186)
New Zealand New Zealand	New Zealand (country)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
La Réunion (France) La Réunion Island	La Réunion Island	introduced invasive cultivated	Lavergne, Christophe (2006) "Cultivé/naturalisé"
French Territory of Mayotte Mayotte Islands	Mayotte Island	introduced invasive cultivated	Comité français de l'Union Internationale pour la Conservation de la Nature en France (2013)
Seychelles Seychelles Islands	Frégate Island		Robertson, S. A./Todd, D. M. (1983) (p. 47)

Comments:  Naturalized and more or less invasive in La Réunion per Christophe Lavergne, pers. com.

Control:  If you know of control methods for Nasturtium officinale, please let us know.