Pacific Island Ecosystems at Risk (PIER)

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Ambrosia artemisiifolia
L., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Ambrosia elatior L.

Common name(s): [more details]

Chinese: tun cao

English: Roman wormwood, annual ragweed, bitterweed, common ragweed, ragweed, short ragweed

French: ambroisie annuelle, petit herbe à poux

Japanese: buta-kusa

Spanish: ambrosia de hojas de ajenjo, artemisia de terra

Habit:  herb

Description:  "Erect, taprooted annual herbs; stems 3-10 dm long, branched at least above, ± hirsute.  Leaves pinnatifid or bipinnatifid, the lobes lanceolate, blades narrowly to broadly ovate or elliptic, 4-10 (-30) cm long, 4-7 (-15) cm wide, upper surface hirsutulous, lower surface strigose and often hirsute on the veins.  Staminate involucre 1.5-2 mm high; pistillate involucre 3-5 mm high in fruit with a single series of short, sharp, erect spines near or above the middle."  (Wagner et al., 1999; p. 256).

Description from the Flora of China online.
Description from the Flora of North America online.

Known to hybridize with Ambrosia psilostachya.

Habitat/ecology:  In Hawai‘i, "naturalized in low elevation, dry, disturbed habitats, especially along roadsides and in pastures, 0-900m" (Wagner et al., 1999; p. 256).

Propagation:  Seed

Native range:  United States and southern Canada (Wagner et al., 1999; p. 256).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 256)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
Wester, Lyndon (1992) (p. 127)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 256)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 256)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 256)
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
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Australia
Australia (continental)
Australia (continental) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Australia
Australia (continental)
Queensland introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
British Columbia (province of Canada)
Province of British Columbia
Canada (British Columbia) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Guatemala (Republic of)   Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 21)
China
China
China (People's Republic of) introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
"Introduced noxious weed of wet to dry soils; below 1000 m. Widely distributed in China".
China
China
China (People's Republic of) introduced
invasive
Li-ying, Li/Ren, Wang/Waterhouse, D. F. (1997) (pp. 172, 178)
China
China
Hong Kong introduced
invasive
Wu, Te-lin (2001) (p. 274)
In wasteland.
Japan
Japan
Japan (country) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 209)
"Waste places, cultivated land. Ragweed is only known in N.Z. as a casual and seed impurity".
South America (Pacific rim)
South America (Pacific rim)
Chile (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim)
South America (Pacific rim)
Colombia (Republic of)   Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 21)
South America (Pacific rim)
South America (Pacific rim)
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan
Taiwan Island
Taiwan Island introduced
invasive
Ching-I Peng, ed. (2013)
"A widely naturalized weed along freeways, open construction sites and waste places in lowlands".
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
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Canada
Canada
Canada native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (continental except west coast)
United States (other states)
United States (other states) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (continental except west coast)
United States (other states)
USA (Florida) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 24 MAR 2005 and was last updated on 21 FEB 2013.