Pacific Island Ecosystems at Risk (PIER)

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Nasturtium microphyllum
Boenn. ex Rchb., Brassicaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Rorippa microphylla (Boenn. ex Rchb.) Hyl. ex Á. Löve & D. Löve

Common name(s): [more details]

English: narrow-fruited water cress, one-row watercress, one-row yellow cress

French: cresson à petites feuilles

Hawaiian: lēkō

Japanese: chisa, kawara-chisa

Mangarevan: maru

Habit:  herb

Description:  "Aquatic or semiaquatic, somewhat fleshy, glabrous perennial herbs; stems floating, prostrate, or ascending, rooting at the nodes, hollow, 1-6 dm long, usually 2-6 mm in diameter.  Leaves pinnately compound with (3-) 6-9 leaflets, these ovate to elliptic, 1.5-4 cm long, 0.5-2 cm wide, margins subentire to sinuate-dentate, the terminal one often larger than lateral ones.  Pedicels 11-20 mm long in fruit; petals white, ca. 4 mm long.  Siliques 1.6-2.5 cm long.  Seeds in 1 row per cell, with ca. 100 polygonal depressions on each face" (Wagner et al., 1999; p. 411).

Habitat/ecology:  In Hawai‘i, "naturalized in running water or seasonally wet areas" (Wagner et al., 1999; p. 411).

Propagation:  Seed, vegetatively

Native range:  "Native to western Europe, widely cultivated as a food plant and widely naturalized in many areas" (Wagner et al., 1999; p. 411).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
French Polynesia
Gambier Islands
Mangareva (Gambier) Island introduced
cultivated
St. John, Harold (1988) (p. 14)
Voucher cited: St. John 14862 (BISH)
Persisting from cultivation.
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 411)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 411)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 411)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
cultivated
Wysong, Michael/Hughes, Guy/Wood, K. R. (2007) (p. 3)
Voucher cited: Wysong 557 (BISH)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 411)
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)
As Rorippa microphylla (Boenn. ex Rchb.) Hyl. South Australia, Tasmania, Victoria
Naturalised
Australia
Australia (continental)
New South Wales introduced
invasive
National Herbarium of New South Wales (2013)
As Rorippa microphylla (Boenn. ex Rchb.) Hyl.
Naturalised
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Chile (continental)
Chile
Chile (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Japan
Japan
Japan (country) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
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. 441)
As Rorippa microphylla (Reichb.) Hylander. Streams, ditches and drains.
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
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
United States (continental except west coast)
United States (other states)
United States (other states) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized


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This page was created on 10 MAY 2005 and was last updated on 19 OCT 2006.