Pacific Island Ecosystems at Risk (PIER)

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Lepidium densiflorum
Schrad., Brassicaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: mi hua du xing cai

English: apetalous peppergrass, common pepperweed, greenflower pepperweed, miner's pepperwort, miners cress, miners pepperweed, peppergrass, pepperweed, prairie peppergrass, prairie pepperweed

French: lépidie densiflore, passerage à fleurs denses

Habit:  herb

Description:  "Annual or sometimes biennial herbs; stems ascending to erect, 2-5 dm long, usually branched above base, usually pubescent, the hairs spreading, occasionally glabrate.  Basal leaves 4-6 (-10) cm long, deeply serrate; cauline leaves somewhat reduced, 1-3 cm long, serrate to subentire.  Flowers in dense racemes 5-10 cm long, somewhat narrowed toward apex; sepals ca. 0.5 mm long, caducous, margins white; petals filiform, less than ca. 0.4 mm long, or absent; stamens 2 (4).  Silicles broadly obovate to suborbicular, usually 2-2.5 mm long, the apical notch narrow, prominent, the margins clearly exceeding the style.  Seeds 1-1.3 mm long"  (Wagner et al., 1999; p. 407).

Habitat/ecology:  In Hawai‘i, "known only from disturbed sites on northern, leeward Hawai‘i [island]"  (Wagner et al., 1999; p. 407).

Propagation:  Seed

Native range:  Central and eastern United States (Wagner et al., 1999; p. 407).

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. 407)
Voucher cited: Bryan s.n. (BISH)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Oppenheimer, Hank L. (2004) (p. 10)
West Maui. Voucher cited: Oppenheimer & R. Bartlett H110204 (BISH)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of) introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Seashores, sandy places, roadsides; near sea level to 3800 m. Hebei, Heilongjiang, Jilin, Liaoning, Shandong, Yunnan
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 183)
Mexico
Mexico
Mexico (United Mexican States)   Hafliger, Toni J./Wolf, Matthias (1988) (p. 180)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 430)
"Dry roadsides, stony waste land".
United States (west coast)
United States (west coast states)
USA (Oregon) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (California) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (Washington) 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 4 MAR 2007 and was last updated on 6 MAR 2007.