Coronopus didymus (L.) Sm., Brassicaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Lepidium didymum L.

Common name(s): [more details]

Chinese: xiu qi

English: bittercress, carrot weed, hog's cress, land cress, lesser swine cress, swine cress, swine wartcress, swine watercress, twin cress, wart cress

French: coronope didyme, coronope pinnatifide, senebière didyme

Japanese: karakusa-nazuna

Spanish: cervellina, huamicara, mastuerzo, mastuerzo silvestre, pichicara

Tongan: lesi vao

Habit:  herb

Description:  "Foetid annual or biennial with short-loved rosette and procumbent to ascending glabrous or sparsely hairy stems to 40 cm long.  Leaves 1-2-pinnatifid, narrow-oblong to ovate, glabrous except for sparse spreading hairs on petioles of some basal leaves; rosette leaves petiolate, 6-10 x 1.5-2 cm; stem leaves smaller, usually pinnatifid, rarely 2-pinnatifid, 1-4 x 0.5-1.5 cm.  Racemes (1)-3-5 cm; rachis with sparse spreading hairs; pedicels spreading, 2.5-4 mm long.  Sepals c. 0.5 mm long.  Petals white, less than sepals or 0.  Stamens usually 2, rarely 4.  Silicle broader than long, emarginate, c. 1.5 x 2-2.5 mm; valves finely warty or ridged, separating at maturity; stigma minute, almost sessile in apical notch of silicle.  Seed comma-shaped, light brown, c. 1 mm long."  (Webb et al., 1988; p. 419)

"Sparsely pubescent, aromatic annual or biennial herbs; outer stems prostrate, 1-4 dm long.  Basal leaves oblong in outline, 3-10 cm long, deeply pinnatifid, the lobes dentate, stem leaves similar but shorter.  Petals ca. 1 mm long; stamens 2.  Silicles didymous, 2-2.5 mm wide, finely wrinkled"  (Wagner et al., 1999; p. 403).

Habitat/ecology:  "Occasional in disturbed places" (Whistler, 1988; p. 16).  "[It] may be seen on new, sown and overgrazed pasture, around gateways and watering places, in animal yards, and in many types of cultivated crops" (Holm et al., 1997; p. 245).

In Hawai‘i, "naturalized in dry, disturbed sites, especially common in lawns, 0-2,100 m" (Wagner et al., 1999; p. 403).  In Fiji, "an infrequent weed in waste places at an elevation of 750-800 m" (Smith, 1981; p. 708).  In Niue, mostly seen in plantations, where it is often common" (Sykes, 1970; p. 76).  In Tonga, "a plantation and waste-area weed" (Yuncker, 1959; p. 122).  In New Zealand, "waste land, roadsides, cultivated land, coastal shingly land"  (Webb et al., 1988; p. 419). In New Caledonia, "serait peut-être la "moutarde sauvage" citée comme mauvaise herbe à Nouvéa par Pancher (1858b). Aujourd'hui bien répandu en cultures et terrains vagues" (MacKee, 1994; p. 44).

Propagation:  "It reproduced by seeds that are moved by wind, water, in mud on the feet of birds, animals, and by various activities of man" (Holm et al., 1997; p. 245).

Native range:  South America; 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	Pickard, J. (1984) (p. 206)
Australia (Pacific offshore islands) Lord Howe Island	Lord Howe Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 19) "A common weed of disturbed soil and open wasteland". Vouchers cited: L.A.S. Johnson & A.N. Rodd 1232 (NSW); J. Pickard 2744 (NSW); 1898, J.H. Maiden (NSW); J.D. McComish 197 (NSW)
Australia (Pacific offshore islands) Norfolk Islands	Norfolk Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 8) "A common weed of disturbed soil and open wasteland". Vouchers cited: P. Ralston 56 (A, K), R.M. Laing (CHR)
Chile (offshore islands) Rapa Nui (Easter) Island	Rapa Nui (Easter) Island (Isla de Pasqua)	introduced	Skottsberg, Carl (1953) (p. 81)
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 cultivated	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (pp. 479, 525, 552) Voucher cited: Danton F(1100)890. "Se instaló en las calles del pueblo de San Juan Bautista, probablemente introducida con el forraje y animales importados del continente.  Soporta muy bien el pisoteo".
Cook Islands Cook Islands	Cook Islands		McCormack, Gerald (2013)
Ecuador (Galápagos Islands) Floreana Group	Floreana Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Isabela Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	introduced invasive	Charles Darwin Foundation (2008)
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1981) (p. 708) Voucher cited: Greenwood 880
French Polynesia Gambier Islands	Mangareva (Gambier) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Adventice
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	Kaho‘olawe Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	Kure Atoll	introduced	Starr, Forest/Martz, Kim/Loope, Lloyd (2001) (p. 11) Previously reported, not observed in this survey.
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	Laysan Island	introduced invasive	Staples, George W./Imada, Clyde T./Herbst, Derral R. (2003) (p. 9) Voucher cited: A. Martin 2 (BISH)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	Ni‘ihau Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404) Voucher cited: Mann & Brigham 331 (BISH)
State of Hawaii Hawaiian Islands	Pearl and Hermes Reef	introduced invasive	Starr, Forest/Martz, Kim (1999) (pp. 16, 19) North Island: Scattered in the interior of the island. Southeast Island: Common throughout the island.
Japan (offshore islands) Ogasawara (Bonin) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007)
New Caledonia Îles Loyauté (Loyalte Islands)	Île Lifou	introduced invasive	MacKee, H. S. (1994) (p. 44) Voucher cited: MacKee 27276
New Caledonia New Caledonia	New Caledonia Islands	introduced invasive	Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe (1996) (p. 380) Bien répandu en cultures et terrains vagues.
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	Tassin, Jacques (2005)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	MacKee, H. S. (1994) (p. 44) Vouchers cited: Pancher s.n., Balansa 562, Franc 505, Däniker 670, MacKee 5191, MacKee 35758
New Zealand (offshore islands) Kermadec Islands	Kermadec Islands	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 415) "Waste land, roadsides, cultivated land, coastal shingly land".
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced invasive	Sykes, W. R. (1977) (p. 102)
Niue Niue	Niue Island	introduced invasive	Sykes, W. R. (1970) (p. 76) Voucher cited: CHR 170268
Niue Niue	Niue Island	introduced invasive	Whistler, W. A. (1988) (p. 16)
Niue Niue	Niue Island	introduced invasive	Yuncker, T. G. (1943) (p. 57) Vouchers cited: Yuncker 9795 (BISH), Yuncker 10246 (BISH) "A weed along roadsides and on rocky cliffs".
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 10798 (PAP) Adventice
Tonga Tonga Islands	Tonga Islands		Whistler, W. A. (1988) (p. 16)
Tonga Tonga Islands	Tonga Islands	introduced invasive	Yuncker, T. G. (1959) (p. 122) "Throughout Tonga".
Tonga Tongatapu Group	‘Eua Island	introduced invasive	Yuncker, T. G. (1959) (p. 122) Voucher cited: Yuncker 15586
Tonga Tongatapu Group	Tongatapu Island	introduced invasive	Yuncker, T. G. (1959) (p. 122) Vouchers cited: Yuncker 16233, Hülimann 102
United States (other Pacific offshore islands) Midway Atoll	Eastern Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-7)
United States (other Pacific offshore islands) Midway Atoll	Midway Atoll	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 403-404)
United States (other Pacific offshore islands) Midway Atoll	Sand Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-7)
United States (other Pacific offshore islands) Midway Atoll	Spit Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-7)
Vanuatu New Hebrides Islands	Vanuatu (Republic of)		Swarbrick, John T. (1997) (p. 90)

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)
Australia Australia (continental)	Australia (continental)	introduced invasive	National Herbarium of New South Wales (2013) South Australia, Tasmania, Victoria, Western Australia
Australia Australia (continental)	Queensland	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
British Columbia (province of Canada) Province of British Columbia	Canada (British Columbia)	introduced	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Central America Central America (Pacific rim)	Honduras (Republic of)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
China China	China (People's Republic of)	introduced invasive	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) Roadsides, waste areas, fields; near sea level to 1000 m. Anhui, Fujian, Guangdong, Hubei, Jiangsu, Jiangxi, Shandong, Sichuan, Xinjiang, Yunnan, Zhejiang.
China China	Hong Kong	native	Wu, Te-lin (2001) (p. 111)
Indonesia Indonesia	Indonesia (Republic of)		Hafliger, Toni J./Wolf, Matthias (1988) (p. 163)
Japan Japan	Japan	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Honshu, Kyushu Naturalized
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 183)
Japan Ryukyu Islands	Ryukyu Islands	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
Mexico Mexico	Mexico (United Mexican States)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Sinaloa
New Zealand New Zealand	New Zealand (country)	introduced invasive	Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 419) "Waste land, roadsides, cultivated land, coastal shingly land".
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan Taiwan Island	Taiwan Island	introduced invasive	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) Roadsides, waste areas, fields; near sea level to 1000 m.
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)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
La Réunion (France) La Réunion Island	La Réunion Island	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
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
Canada Canada	Canada	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)

Control:  If you know of control methods for Coronopus didymus, please let us know.