Pacific Island Ecosystems at Risk (PIER)

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Lepidium africanum
(Burm.f.) DC., Brassicaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 10 (Go to the risk assessment)

Common name(s): [more details]

English: African pepperwort, common pepper cress, rubble pepper cress

Habit:  herb

Description:  "Annual or perennial herbs; stems erect, usually 3-7 dm tall, branched in the upper half, the branches usually ascending, glabrous.  Leaves variable; basal leaves usually oblanceolate, toothed, sometimes pinnately lobed, 2-8 cm long; cauline leaves usually linear-oblanceolate 1-4 cm long, toothed to entire, usually sparsely ciliate.  Flowers in elongate racemes, usually 10-18 cm long; sepals 0.7-0.8 mm long, caducous; petals thread-like, shorter than sepals; stamens usually 2.  Silicles ovate to obovate, 2-3 mm long, 1.5-2 mm wide, notch shallow, the margins scarcely exceeding the short style; pedicel ±flattened, adaxial side sparsely puberulent, ±curved.  Seeds ca. 1.5 mm long" (Wagner & Herbst, 1995, p. 17)

"Annual to perennial herb or subshrub, to 75 cm tall, branched in upper part, finely appressed pubescent or glabrous. Stems erect. Leaf lamina narrowly lanceolate-linear to lanceolate or oblanceolate, 1.5-6 cm long, 0.1-0.8 cm broad, attenuate at base, entire to irregularly serrate, acute, sometimes sparsely ciliate; basal leaves ephemeral; stem leaves reduced in size upwards. Inflorescence dense. Sepals ovate, 0.6-0.8 mm long. Petals thread-like, shorter than sepals or absent. Stamens 2. Infructescence racemose, elongate; pedicels 2-3 mm long, finely puberulous. Silicula flattened-ellipsoidal, 2-3 mm long, 1.5-2 mm broad, slightly winged at apex, notched; valves keeled. Seeds ellipsoidal, reddish brown, 1-1.25 mm long"  (Flora of Australia online).

Habitat/ecology:  In Hawai‘i, naturalized as a roadside weed and in waste areas, littoral vegetation, shrubland/grassland/herbland, and dry disturbed sites  (Wagner & Herbst, 1995, p. 17; Oppenheimer, 2003, p. 3; Lorence & Flynn, 2006, p. 16).  In New Zealand, "gardens, railway ballast, waste land, sand dunes, roadsides, especially near the coast"  (Webb et al., 1988; p. 428).

Propagation:  Seed

Native range:  "Native throughout eastern Africa, now a widespread weed of warm temperate to tropical regions" (Flora of Australia online).

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) (p. 19)
"Occasional on the Island. Native throughout eastern Africa, now a widespread weed of warm temperate to tropical regions". Voucher cited: A.N. Rodd (NSW)
Australia (Pacific offshore islands)
Lord Howe Island
Lord Howe Island introduced
invasive
Australian Biological Resources Study (2013)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R. (1995) (p. 17)
Vouchers cited: Herbst & Spence 5321 (BISH), Char & Stemmermann 85.019 (BISH), Engilis 34 (BISH), Takeuchi 5790 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Lorence, David H./Flynn, Tim (2006) (p. 16)
Voucher cited: K.R. Wood 11135 (BISH, PTBG, US)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Oppenheimer, Hank L. (2003) (p. 8)
West Maui. Vouchers cited: Oppenheimer H30124 (BISH, PTBG), Oppenheimer H50125 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Frohlich, Danielle/Lau, Alex (2010) (p. 6)
Voucher cited: K. Kawelo USARMY 91 (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)
Australia (continental) introduced
invasive
National Herbarium of New South Wales (2013)
South Australia, Tasmania, Victoria, Western Australia
Naturalised
Australia
Australia (continental)
New South Wales introduced
invasive
National Herbarium of New South Wales (2013)
Naturalised
Australia
Australia (continental)
Northern Territory introduced
invasive
National Herbarium of New South Wales (2013)
Naturalised
Australia
Australia (continental)
Queensland introduced
invasive
National Herbarium of New South Wales (2013)
Naturalised
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 428)
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
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


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This page was created on 15 DEC 2007 and was last updated on 17 MAY 2013.