Bidens pilosa L., Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results: 

High risk, score: 23 (Go to the risk assessment (Pacific))
Reject, score: 19 (Go to the risk assessment (U.S. (Florida)))

Common name(s): [more details]

Bontoc: nguad, puriket

English: beggar's tick, broom stick, broom stuff, cobbler's pegs, devil's needles, Spanish needle

Fijian: batimadramadra, matakaro, matua kamate, mbatikalawau, mbatimandramandra

Filipino: pisau-pisau

French: bident hérissé, herbe d'aiguille, herbe villebague, piquants noirs

Hawaiian: kī, kī nehe, kī pipili, nehe

Ibatan: dadayem

Japanese: ko-sendangusa

Mangarevan: tarou, taru

Maori (Cook Islands): kamika tuarongo, nīroa, piripiri, piripiri kerekere, piripiri nīroa

Niuean: kofetoga, kofetonga

Pukapukan: pilipili

Spanish: acetillo, amor seco, arponcito, asta de cabra, bidente piloso, cacho de cabra, cadillo, hierba amarilla, masquia, mazote, papunga chipaca, pega-pega, perca, rosilla, sirvulaca

Tahitian: piripiri

Tongan: fisi‘uli

Wallisian: tae puaka

Habit:  herb

Description:  "Erect annual herbs 0.3-1.8 m tall.  Leaves pinnately compound, usually 2.5-13.5 cm long including petiole, leaflets (1-) 3-5 (-7).  Heads 21-42 in compound cymes terminating main stem and lateral branches, discoid and 0.7-1 cm in diameter including ray florets, peduncles 1-9 cm long; outer involucral bracts spatulate-tipped, 2.5-5 mm long; ray florets absent or 4-7 per head, rays white or yellowish, 2-8 mm long; disk florets 35-75 per head, perfect, corollas yellow; pappus of 2-3 (-5) barbed awns 1-2 mm long.  Achenes dark brown or black, straight, wingless, 8-16 mm long, setose."  (Wagner et al, 1999; pp. 279-281).

"An erect annual or perennial herb with branching habit to about 1m high. Leaves are deeply divided into three toothed lobes, with the terminal lobe larger than the other two. Individual flowers are yellow but are tiny and held in dense terminal clusters in a widely branching flowering head. Each flower cluster has four or five short, broad, white 'petals' but these do not persist for very long. The seeds are black, about 1 cm long, with 2 or 3 barbed awns at the tip.  In French Polynesia, American Samoa, and many other places in the Pacific, there is a variety B. pilosa minor, which has white flowers.  In French Polynesia the variety B. pilosa pilosa also occurs." (Waterhouse and Norris, 1987; pp. 274-276)

Key to distinguish between Bidens alba and Bidens pilosa:

Ray florets 5-8 per head, rays 10-16 mm long:  Bidens alba
Ray florets absent or 4-7 per head, rays 2-8 mm long:  Bidens pilosa  (Wagner et al., 1999; pp. 279-281).

Habitat/ecology:  "Cobbler's pegs or beggar's ticks is a prolific ephemeral herb...  It occurs as a major weed of vegetables and other crops; it is common in pastures, plantations, along roadsides and on wasteland throughout the region.  It thrives best in full sun, where the soil is relatively dry and infertile."  (Swarbrick, 1997)  It forms a dense ground cover that prevents regeneration of other species.

Grows well up to 1,300 m, to over 2,000 m in Papua New Guinea.  In Hawai‘i, "widespread in disturbed areas"  (Wagner et al., 1999; pp. 279-281).  In Fiji, "naturalized along trails and roads, in cultivated areas, and on waste land from near sea level to an elevation of about 900 m" (Smith, 1991; pp. 281-282). In New Guinea, "a weed of cultivation, roadsides, forest clearings, plantations and overgrazed pasture. From low altitudes to over 2000 m" (Henty & Pritchard, 1975; p. 64). In Tonga, "a waste-area weed" (Yuncker, 1959; p. 269). Moist uplands in the Galápagos Islands (McMullen, 1999; p. 259).

Propagation:  Seeds, which attach to clothing or animal's fur or feathers. Also dispersed by water.  "Single plants produce up to 6000 seeds, many of which germinate readily, permitting three or four generations a year in some regions.  Sone seeds remain viable in the soil for at least 5 years.  When herbicides have eradicated perennial grasses this weed often becomes dominant"  (Waterhouse, 1994; p. 28).

Native range:  Temperate and tropical America, but introduced early to the Pacific and parts of Asia.

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	Ofu Island		Whistler, W. A. (1990) Voucher cited: Garber 1021
American Samoa Manu‘a Islands	Ofu Island	introduced	Ragone, Diane/Lorence, David H. (2003) (p. 48)
American Samoa Manu‘a Islands	Ta‘u Island		Whistler, W. A. (1990) Vouchers cited: Harris 198, Yuncker 9278, Whistler 1380
American Samoa Manu‘a Islands	Ta‘u Island		Yuncker, T. G. (1945) (p. 67) Vouchers cited: Yuncker 9278 (BISH), W. Harris 198 (BISH)
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1990) (voucher ID: PTBG 9136) Taxon name on voucher: Bidens pilosa
American Samoa Tutuila Islands	Tutuila Island	introduced invasive	Space, James C./Flynn, Tim (2000) (p. 32)
Australia (Pacific offshore islands) Lord Howe Island	Lord Howe Island	introduced	Pickard, J. (1984) (p. 205)
Australia (Pacific offshore islands) Lord Howe Island	Lord Howe Island	introduced	Orchard, Anthony E., ed. (1994) (p. 18) "A weed of disturbed ground, gardens etc." Vouchers cited: R.D. Hoogland 8643 (NSW), P.S. Green 1915 (K), L.A.S. Johnson & A.N. Rodd 1271 (K, NSW), J. Pickard 1477 (NSW), J. Pickard 2801 (NSW) f
Australia (Pacific offshore islands) Norfolk Islands	Norfolk Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 7) "A weed of disturbed ground, gardens etc." Voucher cited: I. Robinson (NSW)
Chile (offshore islands) Rapa Nui (Easter) Island	Rapa Nui (Easter) Island (Isla de Pasqua)	introduced invasive	Meyer, Jean-Yves (2008) (p. 28)
Chile (offshore islands) Rapa Nui (Easter) Island	Rapa Nui (Easter) Island (Isla de Pasqua)	introduced	Skottsberg, Carl (1953) (p. 81)
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. 551)
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. 551)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Rota Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Rota Island	introduced invasive	Space, James C./Waterhouse, Barbara/Denslow, Julie S./Nelson, Duane (2000) (p. 5)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Saipan Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
Cook Islands Northern Cook Islands	Manihiki Atoll		McCormack, Gerald (2011)
Cook Islands Northern Cook Islands	Manuae Atoll (Northern Cook Islands)		McCormack, Gerald (2011)
Cook Islands Northern Cook Islands	Penrhyn (Tongareva) Island		McCormack, Gerald (2011)
Cook Islands Northern Cook Islands	Pukapuka Atoll		McCormack, Gerald (2011)
Cook Islands Northern Cook Islands	Rakahanga Atoll		McCormack, Gerald (2011)
Cook Islands Southern Cook Islands	Aitutaki Atoll	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Cook Islands Southern Cook Islands	‘Atiu Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Cook Islands Southern Cook Islands	Mangaia Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Cook Islands Southern Cook Islands	Ma‘uke Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Cook Islands Southern Cook Islands	Miti‘aro Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Cook Islands Southern Cook Islands	Palmerston (Avarau) Island		McCormack, Gerald (2011)
Cook Islands Southern Cook Islands	Rarotonga Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Cook Islands Southern Cook Islands	Takutea Island		McCormack, Gerald (2011)
Ecuador (Galápagos Islands) Fernandina Group	Fernandina Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Floreana Group	Floreana Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Alcedo, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Cerro Azul, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Federated States of Micronesia Chuuk Islands	Fefan Island	introduced invasive	Space, James C./Waterhouse, Barbara/Denslow, Julie S./Nelson, Duane/Mazawa, Thomas R. (2000) (p. 6)
Federated States of Micronesia Chuuk Islands	Weno (Moen) Island	introduced invasive	Space, James C./Waterhouse, Barbara/Denslow, Julie S./Nelson, Duane/Mazawa, Thomas R. (2000) (p. 6)
Federated States of Micronesia Yap Islands	Ulithi Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
Federated States of Micronesia Yap Islands	Woleai Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
Federated States of Micronesia Yap Islands	Yap (Waqab) Island	introduced invasive	Space, James C./Falanruw, Marjorie (1999) (p. Field notes)
Fiji Fiji Islands	Lakemba Island	introduced invasive	Smith, Albert C. (1991) (pp. 281-282) Voucher cited: Garnock-Jones 884
Fiji Fiji Islands	Moala Island	introduced invasive	Smith, Albert C. (1991) (pp. 281-282) Voucher cited: Bryan 316b
Fiji Fiji Islands	Ngau Island	introduced invasive	Smith, Albert C. (1991) (pp. 281-282) Voucher cited: Smith 7982
Fiji Fiji Islands	Taveuni Island	introduced invasive	Smith, Albert C. (1991) (pp. 281-282) Voucher cited: Weiner 71-7-14D
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1991) (pp. 281-282) Vouchers cited: Greenwood 124, Smith 4312, Parks 20718, Gillespie 4176, DA 11085, DA 11107, DA 11203, DA 7435, DA 6082
Fiji Fiji Islands	Yathata Island	introduced invasive	Smith, Albert C. (1991) (pp. 281-282) Voucher cited: DA 15546
French Polynesia Gambier Islands	Agakauitai Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Gambier Islands	Akamaru Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Gambier Islands	Akamaru Island	introduced	St. John, Harold (1988) (p. 25) Voucher cited: St. John 14692 (BISH)
French Polynesia Gambier Islands	Aukena Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Gambier Islands	Aukena Island	introduced	St. John, Harold (1988) (p. 25) Voucher cited: St. John 14626 (BISH)
French Polynesia Gambier Islands	Mangareva (Gambier) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: B. Huguenin s.n. (PAP) Adventice
French Polynesia Gambier Islands	Mangareva (Gambier) Island	introduced	St. John, Harold (1988) (p. 25) Vouchers cited: Agassiz 128 (GH), St. John 14529 (BISH)
French Polynesia Marquesas Islands	Eiao Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Eiao Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence & M. Teikiteetini 9338 (PAP) Adventice
French Polynesia Marquesas Islands	Fatu Hiva Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Fatu Hiva Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: B.G. Decker 2604 (PAP) Adventice
French Polynesia Marquesas Islands	Hiva Oa Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Hiva Oa Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 4116 (PAP), J. Florence 4185 (PAP), J. Florence 8451 (PAP) Adventice
French Polynesia Marquesas Islands	Tahuata (Tuhuata) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Tahuata (Tuhuata) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: R.L. Oliver & P.A. Schäfer 3067 (PAP) Adventice
French Polynesia Marquesas Islands	Ua Huka (Huahuna, Uahuka) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Ua Huka (Huahuna, Uahuka) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: B.G. Decker 1839 (PAP) Adventice
French Polynesia Marquesas Islands	Ua Pou (Huapu, Uapou, Uapu) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2008)
French Polynesia Marquesas Islands	Ua Pou (Huapu, Uapou, Uapu) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Society Islands	Bora Bora Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Voucher cited: Grant 4860
French Polynesia Society Islands	Bora Bora Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 12003 (PAP) Adventice
French Polynesia Society Islands	Huahine Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Voucher cited: D. Bare 87
French Polynesia Society Islands	Huahine Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence & R. Tahuaitu 11653 (PAP) Adventice
French Polynesia Society Islands	Maupiti (Maurua) Island	introduced invasive	Fosberg, F. R./Sachet, M.-H. (1987) (p. 67) Vouchers cited: Fosberg 64886 (US) [forma pilosa]; Fosberg 64907 (US) [forma minor]
French Polynesia Society Islands	Maupiti (Maurua) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: F.R. Fosberg 64886 (PAP) Adventice
French Polynesia Society Islands	Mehetia (Mahetia, Meetia) Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Voucher cited: Grant 4726
French Polynesia Society Islands	Moorea Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Voucher cited: C. Carier 120
French Polynesia Society Islands	Moorea Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 2151 (PAP), C.L. Cartier 120 (PAP), C.L. Cartier 234 (PAP) Adventice
French Polynesia Society Islands	Mopelia (Mapetia, Maupiha‘a, Maupihoa, Mopiha‘a) Atoll	introduced invasive	Sachet, M.-H. (1983) (p. 35) Voucher cited: Sachet 927 (US)
French Polynesia Society Islands	Raiatea (Havai) Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Voucher cited: Moore 313
French Polynesia Society Islands	Raiatea (Havai) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 10443 (PAP), J. Florence 3459 (PAP) Adventice
French Polynesia Society Islands	Taha‘a Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Voucher cited: Fosberg & Sachet 63410
French Polynesia Society Islands	Taha‘a Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 5262 (PAP), J. Florence 5255 (PAP) Adventice
French Polynesia Society Islands	Tahiti Island	introduced invasive	Welsh, S. L. (1998) (p. 72) Vouchers cited: Grant 4555, BRY 26025
French Polynesia Society Islands	Tahiti Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 2529 (PAP); var. minor (C.L. Blume) E.E. Sherff: J. Florence 2528 (PAP), J. Florence 4460 (PAP) Adventice
French Polynesia Society Islands	Tahiti Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1922) (voucher ID: PTBG 45114) Taxon name on voucher: Bidens pilosa
French Polynesia Society Islands	Tetiaroa Atoll	introduced invasive	Sachet, M.-H./Fosberg, F. R. (1983) (p. 53) Vouchers cited: Fosberg 63792 (US); var. minor (Bl.) Sherff: Fosberg 54585 (US), Fosberg 63768 (US), Raynal 18026 (P), Florence 3256 (P, US)
French Polynesia Society Islands	Tetiaroa Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 3256 (PAP) Adventice
French Polynesia Society Islands	Tupai Island	introduced invasive	Sachet, M.-H. (1983) (pp. 23-24) Voucher cited: Sachet 1979 (US)
French Polynesia Tuamotu Archipelago	Makatea (Ma‘atea) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 2985 (PAP) Adventice
French Polynesia Tuamotu Archipelago	Niau Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 10099 (PAP) Adventice
French Polynesia Tuamotu Archipelago	Rangiroa (Rairoa) Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 9996 (PAP), M.-H. Sachet 1349 (PAP) Adventice
French Polynesia Tuamotu Archipelago	Raro‘ia Atoll	introduced invasive	Meyer, Jean-Yves/Fourdrigniez, Marie (2008) (p. 13) Adventice d'introduction européene.
French Polynesia Tuamotu Archipelago	Takapoto Atoll	introduced invasive	Sachet, M-H. (1983) (pp. 38-39) Voucher cited: Sachet 2075 (US)
French Polynesia Tuamotu Archipelago	Takapoto Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: M.-H. Sachet 2075 (PAP) Adventice
French Polynesia Tuamotu Archipelago	Tikehau (Tikahau) Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 7021 (PAP), J. Florence 7114 (PAP) Adventice
French Polynesia Tuamotu Archipelago	Toau (Tovau) Atoll	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 10223 (PAP) Adventice
French Polynesia Austral (Tubuai) Islands	Raivavae (Raevavae) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 5603 (PAP), J. Florence 5781 (PAP), J. Florence 5811 (PAP) Adventice
French Polynesia Austral (Tubuai) Islands	Rapa Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Voucher cited: J. Florence 6278 (PAP); var. minor (C.L. Blume) E.E. Sherff: J. Florence 6358 (PAP) Adventice
French Polynesia Austral (Tubuai) Islands	Rapa Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2002) (voucher ID: PTBG 42036) Taxon name on voucher: Bidens pilosa
French Polynesia Austral (Tubuai) Islands	Rimatara (Rimitara) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
French Polynesia Austral (Tubuai) Islands	Rurutu Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 6067 (PAP), J. Florence 6178 (PAP) Adventice
French Polynesia Austral (Tubuai) Islands	Tubuai Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Adventice
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	Kaho‘olawe Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	Ni‘ihau Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
Japan (offshore islands) Bonin (Ogasawara) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007) Var. minor (Blume) Sherff
Kiribati Line Islands	Flint Island	introduced invasive	St. John, Harold/Fosberg, F. Raymond (1937) (p. 4) Voucher cited: St. John & Fosberg 17453 (BISH)
Kiribati Line Islands	Malden Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1995) (voucher ID: PTBG 37220) Taxon name on voucher: Bidens pilosa L.
Kiribati Line Islands	Starbuck Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1995) (voucher ID: PTBG 37219) Taxon name on voucher: Bidens pilosa L.
Kiribati Line Islands	Tabuaeran (Fanning) Atoll	introduced invasive	Wester, Lyndon (1985) (p. 31)
Kiribati Line Islands	Teraina (Washington) Island	introduced invasive	Wester, Lyndon (1985) (p. 31)
Kiribati Tungaru (Gilbert) Islands	Butaritari Atoll	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
Kiribati Tungaru (Gilbert) Islands	Butaritari Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 77)
Kiribati Tungaru (Gilbert) Islands	Butaritari Atoll		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1972) (voucher ID: PTBG 31143) Taxon name on voucher: Bidens pilosa
Kiribati Tungaru (Gilbert) Islands	Tarawa Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 73) Voucher: Imada 2003-28 (BISH 697643)
Marshall Islands Ralik Chain	Enewetak (Ãnewetak, Eniwetok) Atoll	introduced invasive	Lamberson, J. O. (1982) (p. 61)
Marshall Islands Ralik Chain	Enewetak (Ãnewetak, Eniwetok) Atoll	introduced	Fosberg, F. Raymond (1990) (p. 38)
Marshall Islands Ralik Chain	Kili (Kõle) Atoll	introduced	Vander Velde, Nancy (year unknown)
Nauru Nauru Island	Nauru Island		Swarbrick, John T. (1997) (p. 88) Not seen by Thaman et al. May have been confused with Bidens alba.
New Caledonia Îles Bélep (Belep Islands)	Île Art	introduced	MacKee, H. S. (1994) (p. 32) Voucher cited: MacKee 30556
New Caledonia Récifs D'Entrecasteaux (D'Entrecasteaux Reefs)	Île Surprise	introduced	MacKee, H. S. (1994) (p. 32) Voucher cited: Blanchon 434, Boulet in MacKee 31456
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. 32) Voucher cited: MacKee 5247
New Caledonia Îles Loyauté (Loyalte Islands)	Île Maré	introduced	MacKee, H. S. (1994) (p. 32) Voucher cited: Däniker 2231
New Caledonia Îles Loyauté (Loyalte Islands)	Îles Ouvéa (Ouvea Atoll)	introduced	MacKee, H. S. (1994) (p. 32) Voucher cited: Blanchon 1529
New Caledonia Îles Loyauté (Loyalte Islands)	Île Tiga	introduced	MacKee, H. S. (1994) (p. 32) Voucher cited: MacKee 45878
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 88)
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. 32) Vouchers cited: Védel s.n., Vieillard 797, Balansa 6a
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. 32) Voucher cited: MacKee 15567
New Zealand (offshore islands) Kermadec Islands	Kermadec Islands	introduced invasive abo. intro.	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 212) "Lowland fields, waste ground, swampy and boggy places".
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced invasive	Sykes, W. R. (1977) (p. 86)
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced invasive	Sykes, W. R./West, C. J. (1996) (p. 459)
Niue Niue	Niue Island	introduced invasive	Sykes, W. R. (1970) (p. 63) Vouchers cited: CHR 170496, CHR 170497, CHR 170498
Niue Niue	Niue Island	introduced invasive	Whistler, W. A. (1988) (p. 9)
Niue Niue	Niue Island	introduced invasive	Space, James C./Flynn, Tim (2000) (p. 7)
Niue Niue	Niue Island	introduced invasive	Whistler, W. A./Atherton, J. (1997) (p. 26)
Niue Niue	Niue Island	introduced invasive	Yuncker, T. G. (1943) (p. 118) Voucher cited: Yuncker 9767 (BISH) "A common roadside and plantation weed".
Niue Niue	Niue Island	introduced invasive	Space, James C./Waterhouse, Barbara M./Newfield, Melanie/Bull, Cate (2004) (p. 39)
Palau Palau (main island group)	Peleliu Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 283)
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago		Peekel, P. G. [translated by E. E. Henty] (1984) (p. 565) Sporadic.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	invasive	Henty, E. E./Pritchard, G. H. (1975) (p. 64) From low altitudes to over 2000 m.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)		Waterhouse, D. F. (1997) (p. 59)
Philippines Philippine Islands	Philippine Islands	introduced invasive	Waterhouse, D. F. (1993) (pp. 63,76)
Philippines Philippine Islands	Philippine Islands		Merrill, Elmer D. (1923) (p. 614) In waste places, chiefly at medium altitudes, ascending to 2,200 m.
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced invasive	St. John, H. (1987) (p. 53) Vouchers cited: R. A. Young 15, J. P. Chapin 980
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced	Fosberg, F. R./Paulay, Gustav/Spencer, T./Oliver, Royce (1989) (p. 15) Voucher cited: Paulay, Spencer & Schuster 668 (US)
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2011) Vouchers cited: J. Florence 10746 (PAP), J. Florence & S. Waldren 11041 (PAP) Adventice
Samoa Western Samoa Islands	Savai‘i Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Samoa Western Samoa Islands	Upolu Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. Field notes.)
Solomon Islands Solomon Islands	Solomon Islands		Swarbrick, John T. (1997) (p. 88)
Solomon Islands Solomon Islands	Solomon Islands	native	Hancock, I. R./Henderson, C. P. (1988) (p. 51)
Tonga Ha‘apai Group	Ha‘ano Island	introduced invasive	Space, James C./Flynn, Tim (2001) (p. 70)
Tonga Ha‘apai Group	Lifuka and Foa Islands	introduced invasive	Space, James C./Flynn, Tim (2001) (p. 70)
Tonga Ha‘apai Group	Tofua Island		Whistler, W. A. (1992) (p. 8) Voucher cited: Scarth-Johnson 84
Tonga Ha‘apai Group	‘Uiha Island	introduced invasive	Space, James C./Flynn, Tim (2001) (p. 70)
Tonga Tonga Islands	Tonga Islands		Yuncker, T. G. (1959) (p. 269) "Found throughout Tonga".
Tonga Tongatapu Group	‘Eua Island	introduced invasive	Space, James C./Flynn, Tim (2001) (p. 58)
Tonga Tongatapu Group	‘Eua Island		Whistler, W. A. (1992) (p. 8) Vouchers cited: Soakai 399, Soakai 897
Tonga Tongatapu Group	‘Eua Island		Yuncker, T. G. (1959) (p. 269) Voucher cited: Yuncker 15605
Tonga Tongatapu Group	Tongatapu Island	introduced invasive	Space, James C./Flynn, Tim (2001) (p. 51)
Tonga Tongatapu Group	Tongatapu Island		Whistler, W. A. (1992) (p. 8) Vouchers cited: Setchell & Parks 15330, Soakai 465, Soakai 607, Soakai 611
Tonga Tongatapu Group	Tongatapu Island		Yuncker, T. G. (1959) (p. 269) Voucher cited: Yuncker 15184
Tonga Tongatapu Group	Tongatapu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1989) (voucher ID: PTBG 3907) Taxon name on voucher: Bidens pilosa
Tonga Vava‘u Group	Vava‘u Island	introduced invasive	Space, James C./Flynn, Tim (2001) (p. 64)
Tonga Vava‘u Group	Vava‘u Island		Whistler, W. A. (1992) (p. 8) Vouchers cited: Soakai 872, Soakai 875
Tonga Vava‘u Group	Vava‘u Island		Yuncker, T. G. (1959) (p. 269) Cited: Crosby.
Tonga Vava‘u Group	Vava‘u Island		Burkill, I. H. (1900) (p. 44)
United States (other Pacific offshore islands) Johnston Atoll	Johnston Island	introduced invasive	Amerson, A. Binion, Jr./Shelton, Philip C. (1976) (p. 60)
United States (other Pacific offshore islands) Midway Atoll	Midway Atoll	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 279-281)
Vanuatu New Hebrides Islands	Vanuatu (Republic of)		Whistler, W. A. (1988) (p. 9)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Alofi Island	introduced invasive	Orapa, Warea (2005)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Futuna Island	introduced invasive	Orapa, Warea (2005)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis (‘Uvea) Island	introduced invasive	Orapa, Warea (2005)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis (‘Uvea) Island	introduced invasive	Meyer, Jean-Yves (2007) (p. 31)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis and Futuna Islands		Whistler, W. A. (1988) (p. 9)

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)	Queensland	introduced invasive	Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
Cambodia Cambodia	Cambodia (Kingdom of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 63,76)
Chile (continental) Chile	Chile (Republic of)		Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
China China	China (People's Republic of)	introduced invasive	Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
China China	Hong Kong	native	Wu, Te-lin (2001) (p. 276) In wasteland.
Colombia Colombia	Colombia (Republic of)		Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
Costa Rica Costa Rica	Costa Rica (Republic of)	native	Missouri Botanical Garden (2011)
El Salvador El Salvador	El Salvador (Republic of)	native	Missouri Botanical Garden (2011)
Guatemala Guatemala	Guatemala (Republic of)	native	Missouri Botanical Garden (2011)
Honduras Honduras	Honduras (Republic of)	native	Missouri Botanical Garden (2011)
Indonesia Indonesia	Indonesia (Republic of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 63,76)
Japan Japan	Japan (country)	introduced invasive	Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
Japan Japan	Japan (country)	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 189) var. pilosa, var. bisetosa Ohtani & Shig. Suzuki, var. intermedia Ohtani & Shig. Suzuki, var. minor (Blume) Sherff and var. radiata Sherff
Malaysia Malaysia	Malaysia (country of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 63,76)
Mexico Mexico	Mexico (United Mexican States)	native	Missouri Botanical Garden (2011)
New Zealand New Zealand	New Zealand (country)	introduced invasive abo. intro.	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 212) "Lowland fields, waste ground, swampy and boggy places".
Nicaragua Nicaragua	Nicaragua (Republic of)	native	Missouri Botanical Garden (2011)
Panama Panama	Panama (Republic of)		Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
Panama Panama	Panama (Republic of)	native	Missouri Botanical Garden (2011)
Perú Perú	Perú (Republic of)		Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
Perú Perú	Perú (Republic of)	native	Missouri Botanical Garden (2011)
Singapore Singapore	Singapore (Republic of)	introduced invasive	Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 18) Naturalised
Taiwan Taiwan	Taiwan Island	introduced invasive	Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (p. 189)
Taiwan Taiwan	Taiwan Island	introduced invasive	Ching-I Peng, ed. (2011) "Roadsides and cultivated fields from low to middle elevations".
Thailand Thailand	Thailand (Kingdom of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 63,76)
Vietnam Vietnam	Vietnam (Socialist Republic of)	introduced invasive	Waterhouse, D. F. (1993) (pp. 63,76)

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. 106)
Australia (Indian Ocean offshore islands) Christmas Island Group	Christmas Island	introduced invasive	Orchard, Anthony E., ed. (1993) (p. 17) Var. minor (Blume) Sherff
British Indian Ocean Territory Chagos Archipelago	Diego Garcia Island	introduced invasive	Topp, J. M. W. (1988) (p. 9)
British Indian Ocean Territory Chagos Archipelago	Diego Garcia Island	introduced invasive	Rivers, Julie (2004) (p. 3) Probably Bidens alba based on voucher by Whistler.
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island	introduced invasive	Holm, Leroy G./Plucknett, D. L./Pancho, J. V./Herberger, J. P. (1977) (pp. 187-190)
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)
Seychelles Seychelles Islands	Agalega Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Stoddart, D. R. (1983) (p. 114) Voucher cited: Stoddart 7246 (US)
Seychelles Seychelles Islands	D'Arros Island		Stoddart, D. R./Coe, M. J./Fosberg, F. R. (1979) (p. 25) Vouchers cited: Gwynne & Wood 1005 (EA), Stoddart 7211 (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 2389 (K)
Seychelles Seychelles Islands	Seychelles Islands	introduced	Weber, Ewald (2003) (p. 69)
Seychelles Seychelles Islands	St. Joseph Island		Stoddart, D. R./Coe, M. J./Fosberg, F. R. (1979) (p. 48) Voucher cited: Gwynne & Wood 956 (EA)

Comments:  Several varieties. Usually invasive wherever present.

Control: 

Physical: "Germination is prevented by mulches if they are thick enough and left undisturbed.  It is susceptible to hand weeding, chipping and cultivation.  Unpalatable to stock.  As it prefers full sunlight it can be controlled by competition from leafy crops, such as cassava and sweet potato.  Tolerates dry air and soil conditions"  (Swarbrick, 1997).  "Grazed by livestock"  (Motooka et al., 2003).

Chemical:   "Susceptible to: 1) residual herbicides, including diuron, bromacil, atrazine, simazine, ropazine, hexazinone, oryzalin and ametryn at standard rates; 2) translocated herbicides, including 2,4-D, glyphosate, amitrole, metribuzin and dicamba at standard rates; 3) contact herbicides including bentazone, diquat and paraquat at standard rates.  Probably susceptible to most herbicides suitable for controlling broad-leaved plants" (Swarbrick, 1997).  "Sensitive to hormone type herbicides"  (Motooka et al., 2003).

Biological: See Waterhouse and Norris (1987; pp. 274-276) and Waterhouse (1994; pp. 28-33) for identification of natural enemies.

Additional information:
Excerpt from the book "Weeds of Hawaii‘s Pastures and Natural Areas; An Identification and Management Guide" (Motooka et al., 2003). (PDF format).

Additional online information about Bidens pilosa is available from the Hawaiian Ecosystems at Risk project (HEAR).

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

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

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