Pacific Island Ecosystems at Risk (PIER)

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Thlaspi arvense
L., Brassicaceae
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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 19 (Go to the risk assessment)

Common name(s): [more details]

Chinese: xi ming

English: bastard cress, fanweed, field pennycress, Frenchweed, Mithridate mustard, pennycress, stinkweed, wild garlic

Habit:  herb

Description:  "Plants (sometimes glaucous), glabrous throughout. Stems (0.9-) 1.5-5.5 (-8) dm. Basal leaves not rosulate; petiole 0.5-3 cm; blade oblanceolate, spatulate, or obovate, 1-5 cm x 4-23 mm, base attenuate or cuneate, margins entire, repand, or coarsely dentate, apex rounded. Cauline leaves: blade oblong, (0.5-) 1.5-4 (-8) cm x (2-) 5-15 (-25) mm, apex rounded, obtuse, or subacute. Fruiting pedicels straight or slightly upcurved, (5-) 9-13 (-15) mm. Flowers: sepals (1.5-) 2-3 (-3.3) x 1-1.5 mm; petals (2.4-) 3-4.5 (-5) x (0.8-) 1.1-1.7 mm, narrowed to clawlike base (ca. 1 mm), apex obtuse or emarginate; filaments (1-) 1.5-2.2 mm; anthers 0.3-0.5 mm. Fruits obovate or suborbicular, (0.6-) 0.9-2 cm x (5-) 7-20 mm, base obtuse or rounded, apex deeply emarginate, notch ca. 5 mm deep; wings broad throughout, 1-1.5 mm wide basally, 3.5-5 mm wide apically; ovules 6-16 per ovary; style 0.1-0.3 mm. Seeds (1.2-) 1.6-2 (-2.3) x 1.1-1.3 mm, concentrically striate"  (Flora of North America online).

Habitat/ecology:  In the United States:  "Roadsides, fields, waste places, lawns, gardens, railroad tracks, stream banks, bluffs, thickets, slopes, floodplains, woods; 0-2000 m"  (Flora of North America online).  In China (native): "Roadsides, grassy slopes, fields, waste places; 100-5000 m"  (Flora of China online).

Propagation:  Seed

Native range:  Europe and Asia; naturalized elsewhere (GRIN).

Presence:

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
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Victoria
Naturalized
Australia
Australia (continental)
New South Wales introduced
invasive
National Herbarium of New South Wales (2013)
Weed of waste places.
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Chile (continental)
Chile
Chile (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
China
China
China (People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Japan
Japan
Japan (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Hokkaido, Honshu, Kyushu, Shikoku
Japan
Ryukyu Islands
Ryukyu Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
North Korea
North Korea
North Korea (Democratic People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South Korea
South Korea
South Korea (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 447)
Arable fields, waste land.
United States (west coast)
United States (west coast states)
USA (Oregon) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (California) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (Washington) introduced
U.S. Dept. Agr., Nat. Res. Cons. 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
Canada (except British Colombia)
Canada
Canada (country) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
U.S. Dept. Agr., Nat. Res. Cons. 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 3 SEP 2012 and was last updated on 1 OCT 2012.