Chenopodium ambrosioides L., Chenopodiaceae

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Present on Pacific Islands?  yes

Threat only at high elevations?  no

Other Latin names:  Dysphania ambrosioides (L.) Mosyakin & Clemants

Common name(s): [more details]

Chamorro: alapasotes, apasotes

English: American wormseed, bluebush, Indian goosefoot, Jerusalem tea, Mexican tea, Spanish-tea, wormseed

Fijian: wai ni ukuwomu

French: ambroisie du Mexique, botrice, chenopode ambroisine, herbe à puces

Japanese: ke-aritaso

Spanish: apazote, aposote, epazote, hierba hormiguera, huacatay, paico, pazote

Habit:  herb

Description:  "Annual aromatic herb, to 50 cm tall; leaves oblong-lanceolate, short-petiolate, to 9 cm long, somewhat repand-dentate distally; flowers in dense small spikes in axils; perianth 3-lobed, enclosing the fruit; seed glossy."  (Stone, 1970)"Malodorous annual or perennial herbs; stems erect or ascending, 3-10 (-15) dm long, unbranched or paniculately branched, glandular-dotted with yellow glands, sometimes also glandular villous.  Leaves variable and usually dimorphic, always with numerous small, linear, lanceolate to oblanceolate or spatulate leaves usually 0.5-2 cm long, 0.2-0.6 cm wide, margins entire or sometimes sinuate-dentate, often also with scattered large, well-developed, lanceolate to ovate leaves 2-12 cm wide, margins sinuate-dentate to pinnatifid, all leaves copiously glandular-dotted, occasionally glands absent, also puberulent to short-villous.  Flowers usually in dense, terminal or axillary glomerules grouped in slender, elongate spikes, these naked or leafy, sometimes paniculate, or sometimes flowers solitary, subtended by small bracts; calyx ca. 1 mm long, completely enclosing the fruit at maturity, the lobes not keeled, glandular-dotted or sometimes glabrous or short-villous.  Seed dark brown, horizontal or vertical, 0.6-0.8 (-1.2) mm in diameter, margins obtuse"  (Wagner et al., 1999; p. 537).

Habitat/ecology:  "It is frequently found in disturbed sites, wastelands, along roadsides and ditches, and in annual and perennial crops.  Plants occur from sea level to 1200 m on the Pacific islands of Hawaii and grow in annual precipitation ranges of 31 to 430 cm, in mean annual temperatures of 6.9 to 27.4° C and in soils with a pH of 5.0 to 8.7" (Holm et al., 1997; p. 174).

In Hawai‘i, "naturalized in dry, usually disturbed sites in pastures, on open lava flows, or along roadsides at higher elevations, rarely in sandy sites near beaches, (30-) 600-2,450 m" (Wagner et al., 1999; p. 537).  In Fiji, "occurring from near sea level to about 750 m elevation as a naturalized weed in waste places, gardens, etc." (Smith, 1981; pp. 295-296). In New Caledonia, "espèce rudérale largement répandue sans être abondante; cultivée jadis et parfois employée à présent comme plante médicinale et pour éloigner la vermine du poulailler" (MacKee, 1994; p. 29).  In Papua New Guinea, "a weed of open places, along village tracks and river banks, on sandy or rocky soils, at 0-2000 m altitude"  (Henty, 1981; p. 21).

Propagation:  Seed

Native range:  Mexico, Central and South America and the West Indies (Wagner et al., 1999; p. 537).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia (Pacific offshore islands) Norfolk Islands	Norfolk Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 8) "A weed of waste places, native to tropical America but now widespread in weedy habitats". Vouchers cited: W.R. Sykes NI 577 (CHR), W.R. Sykes NI 638 (CHR), J.D. McComish 170 (NSW), J.D. McComish 170A (NSW)
Ecuador (Galápagos Islands) Floreana Group	Floreana Island	introduced invasive cultivated	Charles Darwin Research Station (2005)
Ecuador (Galápagos Islands) Isabela Group	Volcan Sierra Negra	introduced invasive cultivated	Charles Darwin Research Station (2005)
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced invasive cultivated	Charles Darwin Research Station (2005)
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1981) (pp. 295-296) Vouchers cited: Tothill 667, H.B.R. Parham 498, DA 2918, DA 2919
French Polynesia Society Islands	Tahiti Island	introduced invasive cultivated	Florence, J. (2004) (p. 106)
French Polynesia Tubuai (Austral) Islands	Raivavae (Raevavae) Island	introduced invasive cultivated	Florence, J. (2004) (p. 106)
Guam Guam Island	Guam Island	introduced cultivated	Stone, Benjamin C. (1970) (pp. 265-266) Rare in cultivation.
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 67) Rare in cult. per Stone, naturalized per Fosberg.
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 537)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Staples, George W./Imada, Clyde T./Herbst, Derral R. (2002) (p. 7) Voucher cited: C. Corn et al. ESP-386 (BISH)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 537)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 537)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 537)
Japan (offshore islands) Bonin (Ogasawara) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007)
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 cultivated	MacKee, H. S. (1994) (p. 29) Vouchers cited: Schmid 999 (NOU), MacKee 28331
New Caledonia Îles Loyauté (Loyalte Islands)	Île Maré	introduced invasive cultivated	MacKee, H. S. (1994) (p. 29) Voucher cited: Schmid 2193 (NOU)
New Caledonia Îles Loyauté (Loyalte Islands)	Île Tiga	introduced invasive cultivated	MacKee, H. S. (1994) (p. 29) Voucher cited MacKee 45860
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 89)
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 invasive cultivated	MacKee, H. S. (1994) (p. 29) Vouchers cited: Germain s.n. s.loc., Pennel 373, Cribs 796, MacKee 3596, Corbasson in MacKee 20257, MacKee 42521
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 cultivated	MacKee, H. S. (1994) (p. 29) Voucher cited: Baumann 13906
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	introduced invasive	Henty, E. E., ed. (1981) (p. 21)
Philippines Philippine Islands	Philippine Islands	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)

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)	New South Wales	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)
Australia Australia (continental)	Queensland	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)
Cambodia Cambodia	Cambodia (Kingdom of)	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)
Chile (continental) Chile	Chile (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 81-82)
China China	China (People's Republic of)	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)
Colombia Colombia	Colombia (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Costa Rica Costa Rica	Costa Rica (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Ecuador (Mainland) Ecuador	Ecuador (Republic of) (continental)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 81-82)
El Salvador El Salvador	El Salvador (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Guatemala Guatemala	Guatemala (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Honduras Honduras	Honduras (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Japan Japan	Japan (country)	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 524) "Open waste places, roadsides, especially recently disturbed areas, also in sandy coastal areas behind beaches near settlements".
Nicaragua Nicaragua	Nicaragua (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Panama Panama	Panama (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Perú Perú	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Taiwan Taiwan	Taiwan Island	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)
Vietnam Vietnam	Vietnam (Socialist Republic of)	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)

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	introduced invasive	Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 172)

Also reported from
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
United States (continental except west coast) United States (other states)	United States (other states)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)

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

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

References:

Charles Darwin Research Station. 2005. CDRS Herbarium records.

Florence, J. 2004. Flore de la Polynésie française, Vol. 2. Paris. IRE Editions, Publications Scientifiques, Collection Faune et Flore Tropicales 41. 503 pp.

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

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.

Henty, E. E., ed. 1981. Handbooks of the flora of Papua New Guinea, vol. 2. Melbourne University Press, Melbourne. 276 pp.

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

Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. 1979. A geographical atlas of world weeds. John Wiley & Sons, New York. 391 pp.

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

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

Orchard, Anthony E., ed. 1994. Flora of Australia. Vol. 49, Oceanic islands 1. Australian Government Publishing Service, Canberra.

Smith, Albert C. 1981. Flora Vitiensis nova: a new flora of Fiji. National Tropical Botanical Garden, Lawai, Kauai, Hawaii. Volume 2. 810 pp.

Staples, George W./Imada, Clyde T./Herbst, Derral R. 2002. New Hawaiian plant records for 2000. In: Evenhuis, Neal L. and Eldredge, Lucius G., eds. Records of the Hawaii Biological Survey for 2000. Part 1: Articles. Bishop Museum Occasional Papers. 68:3-18.

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

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.

U.S. Dept. Agr., Agr. Res. Serv. 2007. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

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).

Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. 1988. Flora of New Zealand, Volume IV: Naturalised pteridophytes, gymnosperms, dicotyledons. Botany Division, DSIR, Christchurch. 1365 pp.

Wiggins, I. L./Porter, D. M. 1971. Flora of the Galapágos Islands. Stanford University Press. 998 pp.