Rumex acetosella L., Polygonaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  yes

Other Latin names:  Acetosella vulgaris Fourr.

Common name(s): [more details]

Chinese: xiao suan mo

English: common sheep sorrel, field sorrel, red sorrel, sheep sorrel, small sorrel, sorrel

French: oseille, oseille de brebis, oseille sauvage, petite oseille, sûrette, vinette sauvage

Japanese: himesuiba

Spanish: acedera, acedera menor, acederilla, cizaña, hierba de cristo, hierba roja, lengua de vaca, pactilla, romacilla, romacilla aceitosa, sangre de toro, vinagrerita, vinagrillo

Habit:  herb

Description:  "Slender perennial herbs from a short, somewhat woody rhizome, foliage with a strong sour taste; stems erect, 2-5 dm long.  Leaves primarily basal, lanceolate to oblong, 3-6 (-10) cm long, 1-2 cm wide, glabrous or nearly so, apex acute to obtuse, base narrowly hastate, sometimes some leaves without lobes and base cuneate, petioles 2-5 cm long.  Flowers unisexual (and the plants dioecious), in reddish, branched, racemose inflorescences; tepals ca. 1-1.2 mm long, the valves not enlarging in fruit.  Nuts purplish brown, ca. 1.2-1.5 mm long, the surface glossy, the valves readily separating from the nut"  (Wagner et al., 1999; p. 1066).

"Herbacée pérenne, reconnaissable à ses feuilles épaisses en forme de fer de lance, ses longues inflorescences dressés à petites fleurs rougeâtres et ses infrutescences de petits fruits triangulaires munis de trois petites ailes"  (Meyer, 2008; p. 34).

Habitat/ecology:  "Grass- and heathland, seasonal freshwater wetlands, coastal beaches, rock outcrops.  A highly variable species with four subspecies in Europe.  It grows in forest gaps, bogs, grass- and heathland, mostly on dry sandy or loamy soils.  It forms large stands by vegetative growth, and individual clones may last for decades or longer.  The rosettes may cover large areas within a short time and shade out native species.  The plant is shade intolerant and establishment of seedlings occurs in disturbed sites"  (Weber, 2003; p. 374).

In Hawai‘i, "naturalized in disturbed mesic forest and subalpine woodland, especially in pastures and along roadsides" (Wagner et al., 1999; p. 1066). In New Zealand, "especially in open situations on poor, light, stony or sandy soils from sea level to c. 1500 m, also in riverbeds, poor pastures, pavement cracks, gutters and cultivated ground" (Webb et al., 1988; p. 982).

Propagation:  "Seeds are dispersed by wind, water, and by attaching to animals.  Fragments of roots easily grow to new plants"  (Weber, 2003; p. 374).

Native range:  Eurasia (Wagner et al., 1999; p. 1066).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Chile (offshore islands) Rapa Nui (Easter) Island	Rapa Nui (Easter) Island (Isla de Pasqua)	introduced invasive	Meyer, Jean-Yves (2008) (pp. 34, 43) "Non citée par Zizka (1991), elle a été observée « en une seule station dans le vallon sous le Rano Aroi » (Batud, 2005, Lefeuvre et al., 2005; page 44)" (Meyer, 2008; p. 34).
Chile (offshore islands) Juan Fernández Islands	Isla Más a Tierra (Robinson Crusoe Island)	introduced	Skottsberg, Carl (1953) (p. 216) Very abundant in the barren parts, also seen on some of the high ridges.
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	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557)
Chile (offshore islands) Juan Fernández Islands	Isla Más Afuera (Alejandro Selkirk Island)	introduced	Skottsberg, Carl (1953) (p. 216) Very abundant on the upper plains and hills, frequent in the alpine region f. i. on Las Torres, 1370 m.
Chile (offshore islands) Juan Fernández Islands	Isla Más Afuera (Alejandro Selkirk Island)	introduced invasive	Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands) Juan Fernández Islands	Isla Más Afuera (Alejandro Selkirk Island)	introduced invasive	Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 557)
French Polynesia Society Islands	Tahiti Island	introduced cultivated	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Cultivée
French Polynesia Austral (Tubuai) Islands	Tubuai Island	introduced cultivated	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Cultivée
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1066)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1066) Voucher cited: Heller 2767 (BISH)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1066)
Philippines Philippine Islands	Philippine Islands		Hafliger, Toni J./Wolf, Matthias (1988) (p. 303)
Philippines Philippine Islands	Philippine Islands	introduced invasive	Merrill, Elmer D. (1923) (p. 121) Introduced and thoroughly naturalized at Pauai, altitude about 2,400 m.

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		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
Australia Australia (continental)	Australia (continental)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia Australia (continental)	Northern Territory		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
Australia Australia (continental)	Queensland		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
Central America Central America (Pacific rim)	Costa Rica (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 690)
Central America Central America (Pacific rim)	El Salvador (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 314)
China China	China (People's Republic of)	native	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) "Hilly grasslands, forest margins, moist valleys; 400-3200 m".
Indonesia Indonesia	Indonesia (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
Japan Japan	Japan		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 181)
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)
Mexico Mexico	Mexico (United Mexican States)	introduced invasive	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. 982)
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
South America (Pacific rim) South America (Pacific rim)	Colombia		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)		Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 683)
Taiwan Taiwan Island	Taiwan Island	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (west coast) United States (west coast states)	USA (Oregon)	introduced invasive	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast) United States (west coast states)	USA (California)	introduced invasive	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast) United States (west coast states)	USA (Washington)	introduced invasive	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	Lavergne, Christophe (2006) Subsp. pyrenaicus (Pourr. ex Lapeyr.) Akeroyd.; "Naturalisé/±envahissant"

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 invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (continental except west coast) United States (other states)	USA (Florida)	introduced invasive	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)

Control: 

Physical:  Cutting or mowing results in quick replacement of new shoots.  Seedlings and small patches can be dug out; the crowns and roots must be removed"

Chemical:  "Larger stands can be treated with herbicide, or cut and the regrowth treated chemically"  (Weber, 2003; p. 374).

"La lutte manuelle par arrachage des plants associée à un traitement chimique par pulvérisation d’un herbicide à base de glyphosate sur les rosettes des feuilles sont réalisables mais délicats par la présence de zones humides" (Meyer, 2008; p. 34).