Tridax procumbens L., Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High Risk (Go to the risk assessment) (PDF format).

Common name(s): [more details]

English: coat buttons, tridax daisy, wild daisy

Fijian: tubua leka, tumbualeka, voti

French: herbe caille

Japanese: kotobukigiku

Spanish: cadillo chisaca, flor amarilla, hierba del toro, panquica, rosilla

Habit:  herb

Description:  "A semi-prostrate perennial herb; taproot slender, wavy with many lateral branches; stems more or less ascending, 30 to 50 cm high, branched, round, sparsely to very hairy; leaves simple, opposite, lanceolate to ovate, 3 to 7 cm long, 1 to 4 cm wide, with irregularly toothed margins; base wedge-shaped, shortly-petioled, hairy on both surfaces; inflorescence a terminal involucrate flower head or capitulum, 1 to 2 cm across, solitary on erect peduncle 10 to 25 cm long; involucre 3-seriate, ovate, acute to shortly acuminate, 5 to 6 mm long; receptacle with oblong, hairy scales; ray flowers 3-dentate, few, pale yellow; disk flowers 5-dentate, tubular, yellow to brownish-yellow, with recurved hairy segments; fruit a black achene covered with fine, pale hairs giving a grayish-brown appearance, 2 mm long, 1 mm wide at apex, base narrow; pappus in one row of wide scales, unequal in length, 5 to 6 mm long.  The 3-seriate and hairy involucre, the 3-dentate pale yellow ray flowers, opposite leaves with toothed margins, and semi-prostrate habit are the distinguishing features of this species"  (Holm et al., 1997; p. 864).

"Pubescent herb with prostrate ascending stems and erect peduncles with terminal heads; leaves opposite, broadly lanceolate, coarsely toothed, acute or subacute, cuneate at base, hispid on both surfaces, 1-5 cm long, 1-3.5 cm wide, on petioles 5-15 mm long; peduncle pilose, 10-30 cm long, erect; head about 1 cm long, 2 cm wide; bracts of involucre 3-seriate, puberulent; ray-florets few (about 6), with white ligule about 4-5 mm long; disc-florets yellow; achenes pilose, 2 mm long; pappus 5-6 mm long"  (Stone, 1970; p. 586).

Habitat/ecology:  "Occurs throughout the tropical and subtropical belt of the world and is frequently found in annual crops, roadsides, pastures, fallow land and waste areas, and occasionally in lawns, perennial crops and nurseries.  It is particularly well adapted to coarse-textured soils of tropical regions and is found from sea level to 1000 m. Its wide distribution and importance as a weed are due to its spreading stems and abundant seed production" (Holm et al., 1997; p. 864).

In Guam, "common in waste ground, especially limestone"  (Stone, 1970; p. 586).  In Hawai‘i, "naturalized and relatively common primarily in low elevation, dry, disturbed habitats" (Wagner et al., 1999; pp. 370-372).  In Fiji, "found in some local abundance at elevations from near sea level to 600 m as a naturalized weed in villages, gardens, and plantations, on grassy hills and open slopes, and along roadsides" (Smith, 1991; pp. 288-289).  In New Guinea, "a weed of gardens, cultivation and pastures; often in short grassland. From near sea level to about 700 m, very common" (Henty & Pritchard, 1975; p. 83). "Occasional in dry, sunny places" (Whistler, 1988; p. 13).  "Abundantly naturalized in the lowlands of central and southern Taiwan, along exposed, dry roadsides, on waste grounds and in lawns"  (Digital Flora of Taiwan).

Propagation:  Seed

Native range:  Tropical America, now a pan-tropical weed (Stone, 1970; p. 586). Mexico, Central America, Venezuela and Colombia to Peru and Bolivia (Wagner et al., 1999; pp. 370-372).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1990) (voucher ID: PTBG 10470) Taxon name on voucher: Tridax procumbens
American Samoa Tutuila Islands	Tutuila Island		Swarbrick, John T. (1997) (p. 97)
American Samoa Tutuila Islands	Tutuila Island		Anon. (1988) (p. 3)
American Samoa Tutuila Islands	Tutuila Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1993) (voucher ID: PTBG 43368) Taxon name on voucher: Tridax procumbens
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Pagan Island	introduced	Raulerson, L. (2006) (p. 68)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Rota Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Saipan Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Tinian Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Cook Islands Southern Cook Islands	Rarotonga Island		McCormack, Gerald (2011)
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced invasive	Charles Darwin Foundation (2008)
Federated States of Micronesia Kosrae Island	Kosrae Island	introduced invasive	Josekutty, P. C./Wakuk, E. E./Joseph, M. J. (2002) (p. 63)
Federated States of Micronesia Pohnpei Islands	Pohnpei Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Federated States of Micronesia Yap Islands	Ulithi Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Federated States of Micronesia Yap Islands	Yap (Waqab) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Fiji Fiji Islands	Lakemba Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Voucher cited: Garnock-Jones 906
Fiji Fiji Islands	Matuku Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Voucher cited: Bryan 227
Fiji Fiji Islands	Ngau Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Voucher cited: Smith 7958
Fiji Fiji Islands	Ovalau Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Voucher cited: DA 1362
Fiji Fiji Islands	Vanua Levu Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Vouchers cited: Greenwood 6A, Smith 6591, DA 10782
Fiji Fiji Islands	Vanua Mbalavu Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Vouchers cited: DA 3455, Bryan 585
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1991) (pp. 288-289) Vouchers cited: Greenwood 6, DA 9721, DA 10421, Smith 4313, DA 9488, im Thurn 77, DA 9778, Smith 9616, Greenwood 6C, Greenwood 6B, DA 12612, H.B.R. Parham 33
French Polynesia Marquesas Islands	Ua Pou (Huapu, Uapou, Uapu) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Society Islands	Huahine Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence & R. Tahuaitu 11706 (PAP) Adventice
French Polynesia Society Islands	Moorea Island		University of California (2006)
French Polynesia Society Islands	Tahiti Island	introduced invasive	Welsh, S. L. (1998) (p. 81) Vouchers cited: BRY 25466, BRY 25991
French Polynesia Society Islands	Tahiti Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 2560 (PAP) Adventice
French Polynesia Society Islands	Tahiti Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1981) (voucher ID: PTBG 37215) Taxon name on voucher: Tridax procumbens L.
French Polynesia Tuamotu Archipelago	Hao (Hau) Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Tuamotu Archipelago	Raro‘ia Atoll	introduced invasive	Meyer, Jean-Yves/Fourdrigniez, Marie (2008) (p. 13) Adventice d'introduction européene.
Guam Guam Island	Guam Island	introduced invasive	Stone, Benjamin C. (1970) (p. 586)
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	Kaho‘olawe Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	Ni‘ihau Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
Japan (offshore islands) Bonin (Ogasawara) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007)
Japan (offshore islands) Bonin (Ogasawara) Islands	Chichi-jima		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1973) (voucher ID: PTBG 31194) Taxon name on voucher: Tridax procumbens
Kiribati Banaba Island	Banaba (Ocean) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Kiribati Line Islands	Kiritimati (Christmas) Atoll	introduced invasive	Wester, Lyndon (1985) (p. 33)
Kiribati Phoenix Islands	Kanton Island	introduced invasive	Fosberg, F. R./Stoddart, D. R. (1994) (p. 13) Voucher cited: Fosberg & Stoddart 54887 (US, HAW, K)
Kiribati Phoenix Islands	Orona (Hull) Atoll	introduced invasive	Fosberg, F. R./Stoddart, D. R. (1994) (p. 13) "All plants seen were removed." Voucher cited Fosberg 55742 (US, BISH, K).
Kiribati Tungaru (Gilbert) Islands	Abemama Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 76) Voucher: Imada 2003-140 (BISH 697752)
Kiribati Tungaru (Gilbert) Islands	Butaritari Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Kiribati Tungaru (Gilbert) Islands	Butaritari Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 78)
Kiribati Tungaru (Gilbert) Islands	Butaritari Atoll		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1972) (voucher ID: PTBG 31193) Taxon name on voucher: Tridax procumbens
Kiribati Tungaru (Gilbert) Islands	Maiana Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 9) Voucher: Imada 2003-115 (BISH 697726)
Kiribati Tungaru (Gilbert) Islands	Tarawa Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Kiribati Tungaru (Gilbert) Islands	Tarawa Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 75)
Marshall Islands Ralik Chain	Bikini (Pikinni) Atoll	introduced invasive	Whistler, W. A./Steele, O. (1999) (p. 38)
Marshall Islands Ralik Chain	Bikini (Pikinni) Atoll	introduced	Fosberg, F. R. (1988) (p. 15)
Marshall Islands Ralik Chain	Enewetak (Ãnewetak, Eniwetok) Atoll	introduced invasive	Whistler, W. A./Steele, O. (1999) (p. 38)
Marshall Islands Ralik Chain	Kwajalein (Kuwajleen) Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Marshall Islands Ralik Chain	Kwajalein (Kuwajleen) Atoll	introduced invasive	Whistler, W. A./Steele, O. (1999) (p. 38) Vouchers cited: Fosberg 31165, Herbst 8883, Herbst 8922, Herbst 8944, Herbst 8971, Herbst 8983, Herbst 8989, Whistler 11215
Marshall Islands Ralik Chain	Kwajalein (Kuwajleen) Atoll	introduced invasive	Fosberg, F. R. (1955) (p. 22) Voucher cited: Fosberg 31165 (US)
Marshall Islands Ratak Chain	Majuro (Mãjro) Atoll	introduced invasive	Vander Velde, Nancy (2003) (p. 73)
Marshall Islands Ratak Chain	Maloelap Atoll		Imada, Clyde (2006)
Marshall Islands Ratak Chain	Wotje (Wõjjã) Atoll	introduced	Vander Velde, Nancy/Vander Velde, Brian (2009) (p. 2) Voucher cited: Vander Velde 0514200920
Marshall Islands Ratak Chain	Wotje (Wõjjã) Atoll		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2009) (voucher ID: PTBG 49760) Taxon name on voucher: Tridax procumbens
Nauru Nauru Island	Nauru Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Nauru Nauru Island	Nauru Island	introduced invasive	Thaman, R. R./Fosberg, F. R./Manner, H. I./Hassall, D. C. (1994) (p. 101) Vouchers cited: Fosberg 58657 (US), Scully 145N (US), Thaman & Manner 25 (SUVA), Swarbrick 9548 (BRIU)
New Caledonia Îles Bélep (Belep Islands)	Île Art	introduced	MacKee, H. S. (1994) (p. 39) Voucher cited: MacKee 19442
New Caledonia Récifs D'Entrecasteaux (D'Entrecasteaux Reefs)	Île Surprise	introduced	MacKee, H. S. (1994) (p. 39) Voucher cited: Boulet in MacKee 31445
New Caledonia Îles Loyauté (Loyalte Islands)	Îles Loyauté (Loyalty Islands)	introduced invasive	Tassin, Jacques (2005)
New Caledonia Îles Loyauté (Loyalte Islands)	Île Lifou	introduced	MacKee, H. S. (1994) (p. 39) Vouchers cited: Cheesman 3356 (BM), MacKee 27281
New Caledonia Îles Loyauté (Loyalte Islands)	Île Tiga	introduced	MacKee, H. S. (1994) (p. 39) Voucher cited: MacKee 45875
New Caledonia Îles Loyauté (Loyalte Islands)	Île Walpole	introduced	MacKee, H. S. (1994) (p. 39) Vouchers cited: Hmakone & Sam in MacKee 25877, Benoit in MacKee 34402
New Caledonia Îles Loyauté (Loyalte Islands)	Île Walpole	introduced	Renevier, Alain/Cherrier, Jean-Francois (1991) (p. 16) Voucher cited: Cherrier in MacKee 44063
New Caledonia New Caledonia	New Caledonia Islands	introduced invasive	Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe (1996) (p. 379) Rudérale, nombreuses localités
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	Tassin, Jacques (2005)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced	MacKee, H. S. (1994) (p. 39) Vouchers cited: Compton 1603 (BM), Däniker 135, Barrau 75, Catala 64, Guinaudeau in MacKee 30106
New Caledonia New Caledonia Archipelago	Île des Pins (Isle of Pines)	introduced invasive	Tassin, Jacques (2005)
New Caledonia New Caledonia Archipelago	Île des Pins (Isle of Pines)	introduced	MacKee, H. S. (1994) (p. 39) Voucher cited: MacKee 13080
New Caledonia New Caledonia Archipelago	Île Neba	introduced	MacKee, H. S. (1994) (p. 39) Voucher cited: MacKee 22739
Palau Palau (main island group)	Angaur Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 104)
Palau Palau (main island group)	Angaur Island	introduced invasive	Space, James C./Lorence, David H./LaRosa, Anne Marie (2009) (p. 65)
Palau Palau (main island group)	Angaur Island		Beleu National Museum (Republic of Palau. Koror.) (1978) (voucher ID: BNM 1148) Taxon name on voucher: Tridax procumbens
Palau Palau (main island group)	Babeldaob Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Palau Palau (main island group)	Babeldaob Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 102)
Palau Palau (main island group)	Peleliu Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 291)
Palau Palau (main island group)	Peleliu Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 107)
Palau Palau (main island group)	Peleliu Island		Beleu National Museum (Republic of Palau. Koror.) (1969) (voucher ID: BNM 261) Taxon name on voucher: Tridax procumbens
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	introduced invasive	Peekel, P. G. [translated by E. E. Henty] (1984) (pp. 565, 567) Sporadic; particularly about white settlements. A weed, introduced in early times, but still not present in New Ireland in 1908.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	introduced invasive	Henty, E. E./Pritchard, G. H. (1975) (p. 83) From near sea level to about 700 m, very common.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)		Waterhouse, D. F. (1997) (p. 66)
Philippines Philippine Islands	Philippine Islands	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)
Samoa Western Samoa Islands	Savai‘i Island		Whistler, W. A. (1988) (p. 13)
Solomon Islands Solomon Islands	Solomon Islands		Swarbrick, John T. (1997) (p. 97)
Solomon Islands Solomon Islands	Solomon Islands	introduced invasive	Hancock, I. R./Henderson, C. P. (1988) (p. 116)
Tonga Vava‘u Group	Vava‘u Island		Whistler, W. A. (1988) (p. 13)
Tuvalu Tuvalu (Ellis) Islands	Tuvalu Islands		Swarbrick, John T. (1997) (p. 97)
United States (other Pacific offshore islands) Midway Atoll	Midway Atoll	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 370-372)
United States (other Pacific offshore islands) Midway Atoll	Sand Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-14)
United States (other Pacific offshore islands) Wake Islands	Wake Island	introduced invasive	Whistler, W. A./Steele, O. (1999) (p. 38)
Vanuatu New Hebrides Islands	Vanuatu (Republic of)		Swarbrick, John T. (1997) (p. 97)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis (‘Uvea) Island	introduced invasive	Meyer, Jean-Yves (2007) (p. 32)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis and Futuna Islands		Whistler, W. A. (1988) (p. 13)

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)	Northern Territory	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 862)
Australia Australia (continental)	Queensland	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 862)
Cambodia Cambodia	Cambodia (Kingdom of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)
China China	China (People's Republic of)	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 862)
China China	Hong Kong	native	Wu, Te-lin (2001) (p. 289) In wasteland.
Colombia Colombia	Colombia (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Costa Rica Costa Rica	Costa Rica (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Ecuador (Mainland) Ecuador	Ecuador (Republic of) (continental)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 862)
El Salvador El Salvador	El Salvador (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Guatemala Guatemala	Guatemala (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Honduras Honduras	Honduras (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Indonesia Indonesia	Indonesia (Republic of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)
Japan Japan	Japan (country)	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 862)
Japan Japan	Japan (country)	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 190)
Malaysia Malaysia	Malaysia (country of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Nicaragua Nicaragua	Nicaragua (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Perú Perú	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Singapore Singapore	Singapore (Republic of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)
Singapore Singapore	Singapore (Republic of)	introduced invasive	Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 87) Naturalised
Taiwan Taiwan	Taiwan Island	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 862)
Taiwan Taiwan	Taiwan Island	introduced invasive	Ching-I Peng, ed. (2011)
Thailand Thailand	Thailand (Kingdom of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)
Vietnam Vietnam	Vietnam (Socialist Republic of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 69, 79)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia (Indian Ocean offshore islands) Christmas Island Group	Christmas Island	introduced invasive	Swarbrick, J. T. (1997) (p. 130)
Australia (Indian Ocean offshore islands) Cocos (Keeling) Islands	Cocos (Keeling) Islands	introduced invasive	Orchard, Anthony E., ed. (1993) (p. 37)
British Indian Ocean Territory Chagos Archipelago	Diego Garcia Island	introduced	Stoddart, D. R./Taylor, J. D., eds. (1971) (p. 159) Voucher cited: Stoddart 783 (K, US)
British Indian Ocean Territory Chagos Archipelago	Diego Garcia Island	introduced invasive	Whistler, W. Arthur (1996) (p. 26)
British Indian Ocean Territory Chagos Archipelago	Diego Garcia Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1995) (voucher ID: PTBG 37890) Taxon name on voucher: Tridax procumbens L.
La Réunion (France) La Réunion Island	La Réunion Island	introduced invasive	Comité français de l'Union Internationale pour la Conservation de la Nature en France (2010)
Maldives Maldive Islands	Addu Atoll		Spicer, R. A./Newberry, D. MacC. (1979) (p. 12)
Maldives Maldive Islands	Malè Atoll		Fosberg, F. R. (1957) (p. 35) "Very common generally" Voucher cited: Fosberg 36865 (US)
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (pp. 862, 867)
French Territory of Mayotte Mayotte Islands	Mayotte Island	introduced invasive	Comité français de l'Union Internationale pour la Conservation de la Nature en France (2010) Envahissant principalement dans les milieux perturbés.
Seychelles Seychelles Islands	Agalega Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Stoddart, D. R. (1983) (p. 115) Voucher cited: Stoddart 7283 (US)
Seychelles Seychelles Islands	Coetivy Island		Robertson, S. A./Fosberg, F. R. (1983) (p. 146) Voucher cited: Robertson 3074 (K)
Seychelles Seychelles Islands	D'Arros Island		Stoddart, D. R./Coe, M. J./Fosberg, F. R. (1979) (p. 25) Voucher cited: Stoddart 7164 (US)
Seychelles Seychelles Islands	Marie-Louise Island		Wilson, J. R. (1983) (p. 189)
Seychelles Seychelles Islands	Poivre Island		Robertson, S. A./Fosberg, F. R. (1983) (p. 169) Voucher cited: Robertson 2346 (K)
Seychelles Seychelles Islands	St. Joseph Island		Stoddart, D. R./Coe, M. J./Fosberg, F. R. (1979) (p. 48) Voucher cited: Gwynne & Wood 974 (EA)

Additional information:
Additional online information about Tridax procumbens is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Tridax procumbens as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Tridax procumbens may be available from the Germplasm Resources Information Network (GRIN).

References:

Anon. 1988. Weed list for American Samoa by cropping system. Checklist dated 07/13/88, origin unknown. 3 pp.

Beleu National Museum (Republic of Palau. Koror.). 1969. Voucher specimen #BNM261(Salsedo, Carl A. 140).

Beleu National Museum (Republic of Palau. Koror.). 1978. Voucher specimen #BNM1148(Canfield, J.E. 417).

Charles Darwin Foundation. 2008. Database inventory of introduced plant species in the rural and urban zones of Galapagos. Charles Darwin Foundation, Galapagos, Ecuador.

Charles Darwin Research Station. 2005. CDRS Herbarium records.

Ching-I Peng, ed. 2011. Digital flora of Taiwan (online resource).

Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. 2009. A checklist of the total vascular plant flora of Singapore: native, naturalised and cultivated species. Raffles Museum of Biodiversity Research, National University of Singapore. 273 pp.

Comité français de l'Union Internationale pour la Conservation de la Nature en France. 2010. Les espéces envahissantes en outre-mer (online resource).

Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. 2011. Base de données botaniques Nadeaud de l'Herbier de la Polynésie Française (PAP). (online resource).

Fosberg, F. R. 1955. Northern Marshall Islands Expedition, 1951-1952. Land biota: vascular plants. Atoll Research Bulletin No. 39. Pacific Science Board, National Academy of Sciences, Washington. 22 pp.

Fosberg, F. R. 1957. The Maldive Islands, Indian Ocean. Atoll Research Bulletin No. 58. Pacific Science Board, National Academy of Sciences, Washington. 37 pp.

Fosberg, F. R. 1988. Vegetation of Bikini Atoll. Smithsonian Institution, Washington. Atoll Research Bulletin 315:1-28.

Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce. 1979. A geographical checklist of the Micronesian dicotyledonae. Micronesica 15:1-295.

Fosberg, F. R./Sachet, Marie-Hélène/Stoddart, D. R. 1983. List of the recorded vascular flora of Agalega. In: Sachet, M. H., D. R. Stoddart, and F. R. Fosberg. Floristics and ecology of Western Indian Ocean islands. Atoll Research Bulletin No. 273. Smithsonian Institution, Washington. 253 pp.

Fosberg, F. R./Stoddart, D. R. 1994. Flora of the Phoenix Islands, central Pacific. Smithsonian Institution, Washington. Atoll Research Bulletin 393. 60 pp.

Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe. 1996. Conséquences des introductions d'espèces animales et végétales sur la biodiversité en Nouvelle-Calédonie. Rev. Ecol. (Terre Vie) 51:375-401.

Hancock, I. R./Henderson, C. P. 1988. Flora of the Solomon Islands. Research Bulletin No. 7. Ministry of Agriculture and Lands, Honiara. 203 pp.

Henty, E. E./Pritchard, G. H. 1975. Weeds of New Guinea and their control. 2nd edition. Department of Forests, Division of Botany, Botany Bull. No. 7. Lae, Papua New Guinea. 180 pp.

Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James. 1997. World weeds: natural histories and distribution. John Wiley & Sons. 1129 pp.

Imada, Clyde. 2006. Flora of the Marshall Islands: Maloelap Atoll. Species determinations by Clyde Imada, Bishop Museum Herbarium, Hawai‘i. Unpublished checklist, 2 pp.

Josekutty, P. C./Wakuk, E. E./Joseph, M. J. 2002. Invasive/weedy angiosperms in Kosrae, Federated States of Micronesia. In: Invasive species and their management. Micronesica Suppl. 6:61-65.

Kato, Hidetoshi. 2007. Herbarium records of Makino Herbarium, Tokyo Metropolitan University. Personal communication.

Lorence, David H./Wagner, Warren L. 2008. Flora of the Marquesas Islands. National Tropical Botanical Garden and the Smithsonian Institution. Online database.

MacKee, H. S. 1994. Catalogue des plantes introduites et cultivées en Nouvelle-Calédonie. Muséum National d'Histoire Naturelle, Paris, 164 p.

McCormack, Gerald. 2011. Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga.

Meyer, Jean-Yves. 2007. Rapport de mission sur l'Ile d'Uvea (Wallis & Futuna) du 6 au 17 Novembre 2007: Inventaire preliminaire de la flore vasculaire secondaire [unpublished report]. Délégation à la Recherche, Ministère de l'Education, l'Enseignement Supérieur et la Recherche, B.P. 20981 Papeete, Tahiti, Polynésie française. 39 pp.

Meyer, Jean-Yves/Fourdrigniez, Marie. 2008. Rapport de mission sur l'atoll de Raro‘ia (Tuamotu Centre) du 12 au 19 Octobre 2008: Inventaire preliminaire de la flore vasculaire. de l'avifaune terrestre & marine, et recommandations de conservation et de gestion [unpublished report]. Délégation à la Recherche, Ministère de l'Education, l'Enseignement Supérieur et la Recherche, B.P. 20981 Papeete, Tahiti, Polynésie française. 24 pp.

Mito, Toshikazu/Uesugi, Tetsuro. 2004. Invasive alien species in Japan: the status quo and the new regulation for prevention of their adverse effects. Global Environmental Research 8(2)/2004: 171-191.

National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.). 1981. Voucher specimen #PTBG37215(Art Whistler W 4837).

National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.). 1995. Voucher specimen #PTBG37890(Art Whistler 9844).

Orchard, Anthony E., ed. 1993. Flora of Australia. Vol. 50, Oceanic islands 2. Australian Government Publishing Service, Canberra.

Parham, J. W. 1972. Plants of the Fiji Islands. Revised edition. Government Printer, Suva. 462 pp.

Peekel, P. G. [translated by E. E. Henty]. 1984. Flora of the Bismarck Archipelago for naturalists. Office of Forests, Division of Botany, Lae, Papua New Guinea. 638 pp. ISBN 9980-66-000-7.

Raulerson, L. 2006. Checklist of Plants of the Mariana Islands. University of Guam Herbarium Contribution 37:1-69. .

Renevier, Alain/Cherrier, Jean-Francois. 1991. Flore et vegetation de l'Ile de Walpole. Smithsonian Institution, Atoll Research Bulletin No. 351. 21 pp.

Robertson, S. A./Fosberg, F. R. 1983. List of plants collected on Coetivy Island, Seychelles. In: Sachet, M. H., D. R. Stoddart, and F. R. Fosberg. Floristics and ecology of Western Indian Ocean islands. Atoll Research Bulletin No. 273. Smithsonian Institution, Washington. 253 pp.

Robertson, S. A./Fosberg, F. R. 1983. List of plants of Poivre Island, Seychelles. In: Sachet, M. H., D. R. Stoddart, and F. R. Fosberg. Floristics and ecology of Western Indian Ocean islands. Atoll Research Bulletin No. 273. Smithsonian Institution, Washington. 253 pp.

Smith, Albert C. 1991. Flora Vitiensis nova: a new flora of Fiji. National Tropical Botanical Garden, Lawai, Kauai, Hawaii. Volume 5. 626 pp.

Space, James C./Imada, Clyde T. 2004. Report to the Republic of Kiribati on invasive plant species on the islands of Tarawa, Abemama, Butaritari and Maiana. Cont. no. 2003-006 to the Pac. Biol. Surv. USDA Forest Service and Bishop Museum, Honolulu. 103 pp.

Space, James C./Lorence, David H./LaRosa, Anne Marie. 2009. Report to the Republic of Palau: 2008 update on Invasive Plant Species. USDA Forest Service, Hilo, Hawai‘i. 227 pp.

Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar. 2003. Report to the Republic of Palau on invasive plant species of environmental concern. USDA Forest Service, Honolulu. 174 pp.

Spicer, R. A./Newberry, D. MacC. 1979. The terrestrial vegetation of an Indian Ocean coral islands: Wilingili, Addu Atoll, Maldive Islands. I. Transect analysis of the vegetation. II. A limited quantitative analysis of the vegetation distribution. Atoll Research Bulletin 231. The Smithsonian Institution, Washington, D. C. 25 pp.

Starr, Forest/Starr, Kim/Loope, Lloyd. 2008. Botanical survey of Midway Atoll. Prepared for: United States Fish and Wildlife Service. 27 pp. plus appendices.

Stoddart, D. R./Coe, M. J./Fosberg, F. R. 1979. D'Arros and St. Joseph, Amirante Islands. Atoll Research Bulletin No. 223. The Smithsonian Institution, Washington, D.C. 48 pp.

Stoddart, D. R./Taylor, J. D., eds. 1971. Geography and ecology of Diego Garcia Atoll, Chagos Archipelago. Atoll Research Bulletin No. 149. Smithsonian Institution, Washington. 237 pp.

Stone, Benjamin C. 1970. The flora of Guam. Micronesica 6:1-659.

Swarbrick, J. T. 1997. Environmental weeds and exotic plants on Christmas Island, Indian Ocean: a report to Parks Australia. 101 pp. plus appendix.

Swarbrick, John T. 1997. Weeds of the Pacific Islands. Technical paper no. 209. South Pacific Commission, Noumea, New Caledonia. 124 pp.

Tassin, Jacques. 2005. Jacques Tassin (IAC-CIRAD), personal communication.

Thaman, R. R./Fosberg, F. R./Manner, H. I./Hassall, D. C. 1994. The flora of Nauru. Smithsonian Institution, Washington. Atoll Research Bulletin 392:1-223.

U.S. Dept. Agr., Agr. Res. Serv. 2011. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

University of California. 2006. Moorea Digital Flora Project (online resource).

Vander Velde, Nancy. 0. Nancy Vander Velde, pers. com.

Vander Velde, Nancy. 2003. The vascular plants of Majuro Atoll, Republic of the Marshall Islands. Smithsonian Institution, Atoll Research Bulletin No. 503:1-141.

Vander Velde, Nancy/Vander Velde, Brian. 2009. Specimens from Likiep, Majuro, Wotje and Arno (unpublished checklist). 4 pp.

Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. 1999. Manual of the flowering plants of Hawaii. Revised edition. Bernice P. Bishop Museum special publication. University of Hawai‘i Press/Bishop Museum Press, Honolulu. 1919 pp. (two volumes).

Waterhouse, D. F. 1993. The major arthropod pests and weeds of agriculture in Southeast Asia. The Australian Centre for International Agricultural Research, Canberra. 141 pp.

Waterhouse, D. F. 1997. The major invertebrate pests and weeds of agriculture and plantation forestry in the Southern and Western Pacific. The Australian Centre for International Agricultural Research, Canberra. 93 pp.

Welsh, S. L. 1998. Flora Societensis: A summary revision of the flowering plants of the Society Islands. E.P.S. Inc., Orem, Utah. 420 pp.

Wester, Lyndon. 1985. Checklist of the vascular plants of the northern Line Islands. Smithsonian Institution, Washington. Atoll Reseach Bulletin 287:1-38.

Whistler, W. A. 1988. Checklist of the weed flora of western Polynesia. Technical Paper No. 194, South Pacific Commission, Noumea, New Caledonia. 69 pp.

Whistler, W. A./Steele, O. 1999. Botanical survey of the United States of America Kwajalein Atoll (USAKA) Islands. Prepared for Oak Ridge Institute for Science and Education and the U. S. Army Environmental Center. 111 pp.

Whistler, W. Arthur. 1996. Botanical survey of Diego Garcia, Chagos Archipelago, British Indian Ocean Territory. Isle Botanica. 49 pp.

Wilson, J. R. 1983. Ecology of Marie-Louise, Amirantes Islands. In: Sachet, M. H., D. R. Stoddart, and F. R. Fosberg. Floristics and ecology of Western Indian Ocean islands. Atoll Research Bulletin No. 273. Smithsonian Institution, Washington. 253 pp.

Wu, Te-lin. 2001. Check List of Hong Kong Plants. Hong Kong Herbarium and the South China Institute of Botany. Agriculture, Fisheries and Conservation Department Bulletin 1 (revised). 384 pp.