Pacific Island Ecosystems at Risk (PIER)

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Lepidium bonariense
L., Brassicaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: Argentine cress, Argentine pepper cress, Argentine pepperweed, Argentine pepperwort, peppercress

Habit:  herb

Description:  "Annual or biennial. Stem erect, branched above, hairy, (10)-20-45-(90) cm tall. Leaves hairy. Basal and lower stem leaves falling at flowering, 2-3-pinnatisect with linear segments, (2)-3-10 x 1-4 cm; petiole expanded at base, < lamina. Upper stem leaves becoming sessile, pinnatifid, 1-3 x 0.5-1.5 cm. Racemes 5-15-(30) cm long; rachis hairy; pedicels hairy, spreading, 2.5-4 mm long at fruiting. Sepals with long tangled hairs or glabrous, 0.5-1 x 0.3-0.5 mm. Petals white, linear, much < sepals or 0. Stamens 2. Silicle circular or broadly elliptic, 2.5-3.5 x 2.5-3.5 mm; style free from the narrow wing, c. 0.1 mm long, not protruding beyond the apical notch; valves glabrous with fine veins when ripe. Seeds brown, ovoid, winged, c. 1.5 mm long"  (Webb et al., 1988; p. 429).

Description from Flora of Australia online.

Habitat/ecology:  In New Zealand, "waste land, railway ballast, roadsides"  (Webb et al., 1988; p. 429).  An occasional weed of disturbed soil, wasteland and roadsides on Norfolk and Lord Howe Islands (Flora of Australia).

Propagation:  Seed

Native range:  Northern Argentina, Brazil (Rio Grande do Sul, Santa Catarina), Chile Paraguay, Uruguay; naturalized elsewhere (GRIN).

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)
Lord Howe Island
Lord Howe Island introduced
invasive
Orchard, Anthony E., ed. (1994)
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island introduced
invasive
Orchard, Anthony E., ed. (1994)
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) (pp. 461, 465, 555)
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) (pp. 461, 465, 555)
Voucher cited: Danton G(1427)1192
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 407)
Voucher cited: Herbst 5336 (BISH)
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
National Herbarium of New South Wales (2013)
Not common
Australia
Australia (continental)
Queensland introduced
invasive
National Herbarium of New South Wales (2013)
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 183)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 429)
South America (Pacific rim)
South America (Pacific rim)
Chile (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Georgia, South Carolina


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

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This page was created on 11 FEB 2011 and was last updated on 17 MAY 2013.