Oxalis barrelieri L., Oxalidaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 13 (Go to the risk assessment)

Other Latin names:  Oxalis bahiensis sensu auct. Micr. non Prog.

Common name(s): [more details]

English: barrelier's woodsorrel

French: oseille-marron, oseille-savane, trèfle

Pohnpeian: ansu

Samoan: vine

Habit:  herb

Description:  "An erect herb 20-150 cm high; indument composed of whitish, eseptate hairs, sometimes sparse but apparent on stems, petioles, and lower surfaces of leaflet blades; leaves pinnately 3-foliolate, the petiole 1.5-3.5 cm long, continued into a rachis 5-10 mm long below terminal leaflet, the leaflet blades elliptic to oblong, up to 3.5 x 2.5 cm (terminal one the largest), obtuse or rounded at apex; petals (to 9 x 3.5 mm) pink except toward the greenish or yellowish base; capsules ovoid, 5-10 x 2-5 mm, 5-angled, with 2-4 seeds per locule" (Smith, 1985; pp. 624-625).

Habitat/ecology:  In Fiji, "an infrequent weed of roadsides and cultivated areas" (Smith, 1985; pp. 624-625).  In Samoa, "common in cultivated and disturbed places" (Whistler, 1988; p. 31).

Propagation:  Seed

Native range:  "Indigenous in the West Indies and Central and South America, ...introduced into parts of Africa, Ceylon, and Malesia; it has been noted as an occasional weed in the Caroline and Mariana Islands and Samoa..." (Smith, 1985; pp. 624-625).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
American Samoa Manu‘a Islands	Ofu Island	introduced	Ragone, Diane/Lorence, David H. (2003) (p. 52)
American Samoa Manu‘a Islands	Ofu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1999) (voucher ID: PTBG 264) Taxon name on voucher: Oxalis barrelieri
American Samoa Manu‘a Islands	Ofu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2001) (voucher ID: PTBG 35368) Taxon name on voucher: Oxalis barrelieri L.
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1990) (voucher ID: PTBG 9132) Taxon name on voucher: Oxalis barrelieri
American Samoa Tutuila Islands	Tutuila Island		Swarbrick, John T. (1997) (p. 95)
American Samoa Tutuila Islands	Tutuila Island		Anon. (1988) (p. 2)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Tinian Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 121)
Federated States of Micronesia Chuuk Islands	Chuuk Islands		Swarbrick, John T. (1997) (p. 95)
Federated States of Micronesia Kosrae Island	Kosrae Island	introduced invasive	Lorence, David H./Flynn, Timothy (2010) (p. 21) Naturalized
Federated States of Micronesia Kosrae Island	Kosrae Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1996) (voucher ID: PTBG 24930) Taxon name on voucher: Oxalis barrelieri L.
Federated States of Micronesia Pohnpei Islands	Pohnpei Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 121)
Federated States of Micronesia Pohnpei Islands	Pohnpei Island	introduced	Glassman, S. F. (1952) (p. 57) Vouchers cited: Glassman 2429 (US), Glassman 2839 (US)
Federated States of Micronesia Pohnpei Islands	Pohnpei Island	introduced invasive	Herrera, Katherine/Lorence, David H./Flynn, Timothy/Balick, Michael J. (2010) (p. 119) Vouchers cited: F.R. Fosberg 60440 (BISH), F.R. Fosberg 58439 (BISH), S.F. Glassman 2439 (BISH), S.F. Glassman 2429 (BISH), K. Nagata 1487 (BISH), S. Perlman 21394 (PTBG), P. Raynor 164 (NY, PTBG), M.-H. Sachet 1834 (BISH) Naturalized
Federated States of Micronesia Pohnpei Islands	Pohnpei Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2003) (voucher ID: PTBG 43876) Taxon name on voucher: Oxalis barrelieri
Federated States of Micronesia Yap Islands	Yap (Waqab) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 121)
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1985) (pp. 624-625) Voucher cited: DA L.11758
Fiji Fiji Islands	Viti Levu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1988) (voucher ID: PTBG 32548) Taxon name on voucher: Oxalis barrelieri
Fiji Fiji Islands	Viti Levu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1988) (voucher ID: PTBG 32549) Taxon name on voucher: Oxalis barrelieri
French Polynesia Society Islands	Tahiti Island	introduced invasive	Welsh, S. L. (1998) (p. 211) Voucher cited: Florence 2443
French Polynesia Society Islands	Tahiti Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 2443 (PAP) Adventice
Palau Palau (Belau ) (main island group)	Babeldaob Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 121)
Palau Palau (Belau ) (main island group)	Babeldaob Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 102)
Palau Palau (Belau ) (main island group)	Babeldaob Island		Beleu National Museum (Republic of Palau. Koror.) (1966) (voucher ID: BNM 597) Taxon name on voucher: Oxalis barrelieri L.
Palau Palau (Belau ) (main island group)	Kayangel (Ngcheangel) Island		Wagner, W. L./ Herbst, D. R./Weitzman, A./Lorence, D.H. (2013)
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 121)
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 98)
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island		Beleu National Museum (Republic of Palau. Koror.) (1966) (voucher ID: BNM 1318) Taxon name on voucher: Oxalis barrelieri L.
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island		Beleu National Museum (Republic of Palau. Koror.) (1966) (voucher ID: BNM 596) Taxon name on voucher: Oxalis barrelieri L.
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island		Beleu National Museum (Republic of Palau. Koror.) (1966) (voucher ID: BNM 1317) Taxon name on voucher: Oxalis barrelieri L.
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island		Beleu National Museum (Republic of Palau. Koror.) (1969) (voucher ID: BNM 595) Taxon name on voucher: Oxalis barrelieri L.
Palau Palau (Belau ) (main island group)	Koror (Oreor) Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1966) (voucher ID: PTBG 23514) Taxon name on voucher: Oxalis barrelieri
Palau Palau (Belau ) (main island group)	Malakal (Ngemelachel) Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 98)
Palau Palau (Belau ) (main island group)	Malakal (Ngemelachel) Island	introduced invasive	Space, James C./Lorence, David H./LaRosa, Anne Marie (2009) (p. 64) Voucher: Lorence 9712 (PTBG, BNM, NY, US)
Palau Palau (Belau ) (main island group)	Malakal (Ngemelachel) Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2008) (voucher ID: PTBG 5) Taxon name on voucher: Oxalis barrelieri L.
Palau Palau (Belau ) (main island group)	Ngerkebesang Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 98)
Samoa Western Samoa Islands	Upolu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2002) (voucher ID: PTBG 313) Taxon name on voucher: Oxalis barrelieri
Samoa Western Samoa Islands	Western Samoa Islands		Whistler, W. A. (1988) (p. 31)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Central America Central America (Pacific rim)	Costa Rica (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Nicaragua (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Panama (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia Indonesia	Indonesia (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 259)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore Singapore	Singapore (Republic of)	introduced invasive	Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 65) Naturalised
South America (Pacific rim) South America (Pacific rim)	Colombia	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia (Indian Ocean offshore islands) Christmas Island Group	Christmas Island	introduced invasive cultivated	Swarbrick, J. T. (1997) (p. 122)

Control:  If you know of control methods for Oxalis barrelieri, please let us know.