Sigesbeckia orientalis L., Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 13 (Go to the risk assessment)

Other Latin names:  Siegesbeckia orientalis L.

Common name(s): [more details]

English: Indian weed, nightshade, sigesbeckia, small yellow crown-beard, yellow crown-head

Fijian: senikata

French: herbe de Flacq

Maori (Cook Islands): kamika

Samoan: ‘a‘ami‘a

Tahitian: ‘ami‘a, amia, amiami

Tongan: kakamika

Wallisian: kakamika

Habit:  herb

Description:  "Annual herbs; stems erect, 20-100 cm tall, sometimes purplish, branches ascending-spreading, pseudo-dichotomously branching in upper part, densely or sparsely appressed short pubescent. Median cauline leaves chartaceous or thinly membranaceous, long petiolate, ovate-oblong to deltoid-ovate, 5-14 x 3-12.5 cm, apex short acuminate to acute, base truncate to cuneate or narrowed into winged petiole, margins irregularly obtuse-dentate, 3-nerved, irregularly lobulate on lower margin, densely short pubescent on both surfaces, glandular dotted beneath; upper leaves gradually smaller and narrower, short petiolate, oblong, obtuse, uppermost oblong lanceolate, subsessile. Heads many, 16-21 mm wide, peduncle 1-4.5 cm long, puberulous; involucral bracts 5, spreading, stipitate glandular pilose; ray corolla 1.5-2.5 mm long; disc corolla tubular, yellow, 1.5 mm long. Achenes 2.5-3.5 mm long, truncate, incurved, black, glabrous, 4-angled"  (Digital Flora of Taiwan).

"Many-branched annual herbs; stems 5-12 dm long.  Leaves deltate to elliptic-lanceolate, 2-20 cm long, 0.6-9 cm wide, petioles 0.5-6 cm long, winged.  Involucral bracts 5, glandular pubescent, especially toward the tip.  Achenes 3-4 mm long" (Wagner et al., 1999; p. 357).

Habitat/ecology:  In Hawai‘i, "naturalized in disturbed areas, 0-1,220 m" (Wagner et al., 1999; p. 357).  In Fiji, "occurring from near sea level to about 900 m in dry areas, clearings, waste places, and gardens, along roadsides, and on open hillsides, often in some local abundance" (Smith, 1991; p. 269). In New Guinea, "a weed of cultivation and heavily-grazed pastures. Between 1200 and 2500 m." (Henty & Pritchard, 1975; p. 78). In Tonga, "a plantation and waste-area weed" (Yuncker, 1959; p. 267). In New Caledonia, "très répandu en clairières et lieux incultes mais rarement abondant" (MacKee, 1994; p. 37).

Propagation:  Seed

Native range:  Old World. In most Pacific areas it gives every appearance of being an adventive, although it may have been an inadvertent aboriginal introduction (Smith, 1991; p. 269). "An aboriginal introduction, now becoming rare throughout Polynesia." (Whistler, 1988; p. 11)

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		Whistler, W. A. (1990) Voucher cited: Garber 604
American Samoa Manu‘a Islands	Ta‘u Island		Yuncker, T. G. (1945) (p. 67) Voucher cited: Garber 604 (BISH)
Australia (Pacific offshore islands) Norfolk Islands	Norfolk Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 8) "A weed of disturbed ground". Voucher cited: P.S. Green 1889 (K)
Cook Islands Southern Cook Islands	‘Atiu Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Mangaia Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Ma‘uke Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Miti‘aro Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Rarotonga Island		McCormack, Gerald (2013)
Fiji Fiji Islands	Lakemba Island	introduced invasive	Smith, Albert C. (1991) (pp. 269-270) Voucher cited: Seemann 263
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1991) (pp. 269-270) Vouchers cited: DA 10338, DA 10339, Greenwood 231, DA 8566, DA 9627, DA 9703, DA 11368, DA 10422, Gillespie 4177, DA 9506, DA 11180, DA 9656, DA 9878, DA 11074, DA 12231, Milne 414
French Polynesia Gambier Islands	Mangareva (Gambier) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
French Polynesia Gambier Islands	Mangareva (Gambier) Island	introduced	St. John, Harold (1988) (p. 25) Vouchers cited: Agassiz 127 (GH), St. John 14895 (BISH), Fosberg 11093 (BISH)
French Polynesia Marquesas Islands	Eiao Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Eiao Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Vouchers cited: J. Florence , S.P. Perlman & M. Teikiteetini 9353 (PAP), S.P. Perlman & J. Florence 10054 (PAP) Adventice
French Polynesia Marquesas Islands	Eiao Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1988) (voucher ID: PTBG 9212) Taxon name on voucher: Sigesbeckia orientalis
French Polynesia Marquesas Islands	Fatu Hiva Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Fatu Hiva Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
French Polynesia Marquesas Islands	Hiva Oa Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Hiva Oa Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Vouchers cited: J. Florence 6898 (PAP), J. Florence 8519 (PAP) Adventice
French Polynesia Marquesas Islands	Tahuata (Tuhuata) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Tahuata (Tuhuata) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Vouchers cited: R.L. Oliver & P.A. Schäfer 3028 (PAP), K.R. Wood 6514 (PAP) Adventice. Weeds of village and coconut plantations.
French Polynesia Marquesas Islands	Tahuata (Tuhuata) Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1995) (voucher ID: PTBG 27739) Taxon name on voucher: Sigesbeckia orientalis L.
French Polynesia Marquesas Islands	Ua Huka (Huahuna, Uahuka) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Ua Huka (Huahuna, Uahuka) Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1997) (voucher ID: PTBG 27979) Taxon name on voucher: Sigesbeckia orientalis L.
French Polynesia Marquesas Islands	Ua Pou (Huapu, Uapou, Uapu) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Society Islands	Bora Bora Island		Fosberg, F. R. (1997) (p. 18)
French Polynesia Society Islands	Mehetia (Mahetia, Meetia) Island		Fosberg, F. R. (1997) (p. 18)
French Polynesia Society Islands	Raiatea (Havai) Island		Fosberg, F. R. (1997) (p. 18)
French Polynesia Society Islands	Raiatea (Havai) Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1926) (voucher ID: PTBG 45110) Taxon name on voucher: Sigesbeckia orientalis
French Polynesia Society Islands	Tahiti Island	introduced invasive	Welsh, S. L. (1998) (p. 79)
French Polynesia Austral (Tubuai) Islands	Raivavae (Raevavae) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Vouchers cited: J. Florence 5712 (PAP), J. Florence 5793 (PAP), J. Florence & W.R. Sykes 11207 (PAP) Adventice
French Polynesia Austral (Tubuai) Islands	Rapa Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 6295 (PAP) Adventice
French Polynesia Austral (Tubuai) Islands	Rapa Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1921) (voucher ID: PTBG 45118) Taxon name on voucher: Sigesbeckia orientalis
French Polynesia Austral (Tubuai) Islands	Rimatara (Rimitara) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
French Polynesia Austral (Tubuai) Islands	Rurutu Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
French Polynesia Austral (Tubuai) Islands	Rurutu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1921) (voucher ID: PTBG 45121) Taxon name on voucher: Sigesbeckia orientalis
French Polynesia Austral (Tubuai) Islands	Tubuai Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 357)
State of Hawaii Hawaiian Islands	Kaho‘olawe Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 357)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 357)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Oppenheimer, Hank (2007) (p. 20) Vouchers cited: Oppenheimer & J. Penniman H50613 (BISH, PTBG), Oppenheimer H120645 (BISH, PTBG)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 357)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 357)
State of Hawaii Hawaiian Islands	Ni‘ihau Island	introduced invasive	Wood, K. R. (2007) (p. 14) Voucher cited: K.R. Wood 11864 (BISH, PTBG, US)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 357)
Kiribati Tungaru (Gilbert) Islands	Tarawa Atoll	introduced	Fosberg, F. R./Sachet, M.-H. (1987) (p. 32)
New Caledonia Hunter Island	Île Hunter	introduced invasive	MacKee, H. S. (1994) (p. 37) Voucher cited: Monzier in Veillon 6944 (NOU)
New Caledonia Îles Loyauté (Loyalte Islands)	Îles Loyauté (Loyalty Islands)	introduced invasive	Tassin, Jacques (2005)
New Caledonia Îles Loyauté (Loyalte Islands)	Île Lifou	introduced invasive	MacKee, H. S. (1994) (p. 37) Vouchers cited: Deplanche 802, MacKee 27190
New Caledonia Îles Loyauté (Loyalte Islands)	Îles Ouvéa (Ouvea Atoll)	introduced invasive	MacKee, H. S. (1994) (p. 37) Voucher cited: Däniker 2035a
New Caledonia Îles Loyauté (Loyalte Islands)	Île Tiga	introduced invasive	MacKee, H. S. (1994) (p. 37) Voucher cited: MacKee 45922
New Caledonia New Caledonia	New Caledonia Islands	introduced	Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe (1996) (p. 379) Très répandue en clairières et lieux incultes mais rarement abondante. Peut-être d'introduction ancienne.
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	Tassin, Jacques (2005)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	MacKee, H. S. (1994) (p. 37) Vouchers cited: Védel s.n., Vieillard 802, MacGillivray s.n., Balansa 8, Cribs 953, MacKee 12528, MacKee 34773
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 invasive	MacKee, H. S. (1994) (p. 37) Voucher cited: MacKee 13054
New Zealand (offshore islands) Kermadec Islands	Kermadec Islands	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 226) "Forest margins and clearings, coastal sites, riverbeds, pasture".
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced abo. intro.	Sykes, W. R. (1977) (p. 95) Not found since 1908.
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced	Sykes, W. R./West, C. J. (1996) (p. 459)
Palau Palau (Belau ) (main island group)	Babeldaob Island		Raulerson, L./Rinehart, A. F./Falanruw, M. C. (1996) (p. 25)
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	invasive	Peekel, P. G. [translated by E. E. Henty] (1984) (p. 561) Common weed in the gardens of the natives.
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. 78) Mostly between 1200 and 2500 m.
Philippines Philippine Islands	Philippine Islands		Merrill, Elmer D. (1923) (p. 610) In open waste places, fallow fields, etc., chiefly at medium altitudes, ascending to 2,100 m in Benguet.
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced	St. John, H. (1987) (p. 54) Voucher cited: Fosberg & R. Clark 11298
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence & S. Waldren 11042 (PAP) Adventice
Samoa Western Samoa Islands	Western Samoa Islands		Whistler, W. A. (1988) (p. 11) Uncommon per Whistler.
Tonga Ha‘apai Group	Ha‘apai Islands		Whistler, W. A. (1992) (p. 9) Voucher cited: Soakai 528
Tonga Ha‘apai Group	Tofua Island		Whistler, W. A. (1992) (p. 9) Voucher cited: Scarth-Johnson 93
Tonga Tonga Islands	Tonga Islands	introduced invasive	Yuncker, T. G. (1959) (p. 267) "Throughout Tonga".
Tonga Tongatapu Group	‘Eua Island		Whistler, W. A. (1992) (p. 9) Vouchers cited: Soakai 331, Soakai 912 (EI)
Tonga Tongatapu Group	‘Eua Island	introduced invasive	Yuncker, T. G. (1959) (p. 267) Voucher cited: Yuncker 15429
Tonga Tongatapu Group	Tongatapu Island		Whistler, W. A. (1992) (p. 9) Vouchers cited: Moseley s.n., Setchell & Parks 15613, Ilolahia 114, Soakai 175
Tonga Tongatapu Group	Tongatapu Island	introduced invasive	Yuncker, T. G. (1959) (p. 267) Vouchers cited: Yuncker 15092, Yuncker 15258
Tonga Vava‘u Group	Vava‘u Island		Whistler, W. A. (1992) (p. 9) Voucher cited: Harvey s.n.
Tonga Vava‘u Group	Vava‘u Island	introduced invasive	Yuncker, T. G. (1959) (p. 267) Cited: Crosby.
Tonga Vava‘u Group	Vava‘u Island		Burkill, I. H. (1900) (p. 43)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis and Futuna Islands		Whistler, W. A. (1988) (p. 11)

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)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 337)
Australia Australia (continental)	Queensland	introduced invasive	Queensland Herbarium (2002) (p. 7)
China China	Hong Kong	native	Wu, Te-lin (2001) (p. 287) In wasteland.
Indonesia Indonesia	Indonesia (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 337)
New Zealand New Zealand	New Zealand (country)	introduced invasive abo. intro.	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 226) "Forest margins and clearings, coastal sites, riverbeds, pasture".
Singapore Singapore	Singapore (Republic of)	uncertain if introduced invasive	Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 80) Weed of uncertain origin
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 337)
Taiwan Taiwan Island	Taiwan Island		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 337)
Taiwan Taiwan Island	Taiwan Island	native	Ching-I Peng, ed. (2013) "Widespread in waste fields at low elevations".

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 337)
Seychelles Seychelles Islands	Agalega Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Stoddart, D. R. (1983) (p. 114)
Seychelles Seychelles Islands	Seychelles Islands	introduced	Invasive Species Specialist Group (2017)

Control:  If you know of control methods for Sigesbeckia orientalis, please let us know.