Tetragonia tetragonoides (Pall.) Kuntze, Aizoaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 7 (Go to the risk assessment).

Common name(s): [more details]

Chinese: fan xing

English: New Zealand spinach, warrigal cabbage

French: epinard, tétragone cornue

Spanish: espinaca

Habit:  herb

Description:  "Succulent, stout annual herbs; branches numerous, spreading or procumbent, 3-15 dm log.  Leaves deltate to rhombic-ovate, 2-12 cm long, 1.5-5 cm wide, pubescent with bladder-like hairs, margins entire to undulate, apex obtuse to acute, base truncate to cuneate, abruptly constricted to a winged petiole 1-1.5 cm long.  Flowers sometimes unisexual, 1 (2), axillary; sepals 4 (5), green externally, yellow within, spreading, 1.5-2.5 mm long; stamens 10-20, greenish yellow; ovary inferior, 3-8-celled, subsessile.  Fruit nut-like, fleshy when young, dry and indurate with age, turbinate, angled, ca. 10 mm long, the apex with 2-5 horn-like projections from which another flower or branchlet is occasionally produced.  Seeds usually 1 per cell, reniform, ca. 2 mm in diameter" (Wagner et al., 1999; p. 178).

Habitat/ecology:  "In the wild, New Zealand spinach inhabits coastal sand dues and has become naturalized in similar habitats all over the world, including several of the larger Hawaiian islands"  (Staples & Herbst, 2005; p. 98).  In Hawai‘i, "cultivated and now established in scattered coastal sites" (Wagner et al., 1999; p. 178).

Propagation:  Seed, spread by water.

Native range:  "New Zealand, Tasmania, Australia, Japan and South America" (Wagner et al., 1999; p. 178).

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) Rapa Nui (Easter) Island	Rapa Nui (Easter) Island (Isla de Pasqua)	native	Meyer, Jean-Yves (2008) (p. 47)
Chile (offshore islands) Juan Fernández Islands	Isla Más a Tierra (Robinson Crusoe Island)	introduced invasive cultivated	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. 558)
Chile (offshore islands) Juan Fernández Islands	Isla Más Afuera (Alejandro Selkirk Island)	introduced invasive cultivated	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. 558)
Chile (offshore islands) Juan Fernández Islands	Isla Santa Clara	introduced invasive cultivated	Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands) Juan Fernández Islands	Isla Santa Clara	introduced invasive	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 558)
Ecuador (Galápagos Islands) Isabela Group	Isabela Island	introduced cultivated	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	introduced cultivated	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	introduced cultivated	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced cultivated	Charles Darwin Foundation (2008)
French Polynesia Austral (Tubuai) Islands	Raivavae (Raevavae) Island	native	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 5825 (PAP)
French Polynesia Austral (Tubuai) Islands	Rapa Island	native	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Vouchers cited: J. Florence 6420 (PAP), N. Hallé 7561 (PAP)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive cultivated	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 178)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive cultivated	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 178)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Oppenheimer, Hank (2010) (p. 33) Voucher cited: Oppenheimer H50805 (BISH, PTBG)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Oppenheimer, Hank L./Meidell, J. Scott/Bartlett, R. T. (1999) (p. 7) West Maui. Vouchers cited: Oppenheimer 302 (BISH), Oppenheimer H99805 (BISH)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2003) (p. 23) East Maui. Vouchers cited: Starr & Martz 010821-1 (BISH), Starr & Martz 010821-2 (BISH), Starr & Martz 010821-3 (BISH), Starr & Martz 020109-2 (BISH)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2006) (pp. 31-32) Voucher cited: Starr & Starr 050517-13 (BISH)
State of Hawaii Hawaiian Islands	Nihoa Island	introduced invasive cultivated	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 178)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive cultivated	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 178) Voucher cited: Forbes 1406.O (BISH)
Japan (offshore islands) Ogasawara (Bonin) Islands	Bonin (Ogasawara) Islands		Kato, Hidetoshi (2007)
New Zealand (offshore islands) Kermadec Islands	Curtis Island	native	Sykes, W. R. (1977) (pp. 74-75)
New Zealand (offshore islands) Kermadec Islands	Raoul Island	native	Sykes, W. R. (1977) (pp. 74-75)
United States (other Pacific offshore islands) Johnston Atoll	Johnston Island	introduced cultivated	Amerson, A. Binion, Jr./Shelton, Philip C. (1976) (p. 55)
United States (other Pacific offshore islands) Midway Atoll	Midway Atoll	introduced invasive	Starr, Forest/Martz, Kim (2000) (p. 10) Voucher cited: Starr & Martz 990510-5 (BISH)
United States (other Pacific offshore islands) Midway Atoll	Sand Island		Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (p. 24) Not seen in this survey, probably eradicated.

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)	native	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) "Sandy shores, also cultivated".
China China	Hong Kong	native	Wu, Te-lin (2001) (p. 75)
Japan Japan	Japan	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
New Zealand New Zealand	New Zealand (country)	native	Allan, H. H. (1982) (p. 204)
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)	native	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	Lavergne, Christophe (2006) "Naturalisé (localement)"
La Réunion (France) La Réunion Island	La Réunion Island	introduced invasive cultivated	Comité français de l'Union Internationale pour la Conservation de la Nature en France (2013) "Envahissant".

Control:  If you know of control methods for Tetragonia tetragonoides, please let us know.