Pacific Island Ecosystems at Risk (PIER)

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Ammannia auriculata
Willd., Lythraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: er ji shui xian

English: eared redstem

Habit:  herb

Description:  "Slender annual 0.5-5(8) dm tall, simple or branched above the base, the branches ascending. Leaves linear-lanceolate to linear-oblong, 1-4(6.5) cm long, 1.5-6(10) mm wide, auriculate-clasping at the base. Inflorescences of simple to compound, rather open cymes, peduncled from the axils, with (1)3-12(15) flowers per axil, most with at least 7 flowers; peduncles filiform, 3-9 mm long; pedicels 1-3(6) mm long. Calyx tube 1-3 mm long in flower, the lobes alternating with short appendages or the appendages absent; petals 4, deep rose-purple, ca. 1.5 mm long; stamens 4(-8), anthers deep yellow when fresh; styles 1-3 mm long in fruit. Capsules 1.5-3 mm in diameter, equaling or exceeding the calyx" (Aquatic and Wetland Vascular Plants of the Northern Great Plains).

Habitat/ecology:  "Muddy shores, flats and low spots in fields where water stands temporarily" (Aquatic and Wetland Vascular Plants of the Northern Great Plains).

Propagation:  Seed

Native range:  Americas, Africa, Asia

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands   Merrill, Elmer D. (1923) (p. 135)
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. 46)
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) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Western Australia
Australia
Australia (continental)
Northern Territory native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
El Salvador (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of)   Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Wet places, rice farms.
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 186)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim)
South America (Pacific rim)
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim)
South America (Pacific rim)
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Lima, Piura
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. (2013)

Comments:  See p. 1884, Wagner et al., 1999. Misidentified and not present in Hawai‘i.


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This page was created on 1 JAN 1999 and was last updated on 12 OCT 2006.