Sisyrinchium micranthum Cav., Iridaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: scourweed

Fijian: wa ma ndrala

Habit:  herb

Description: 

Genus: "Herbs with fibrous roots or short rhizomes, the leaves with narrow, linear, sword-shaped, or terete blades (not more than 12 cm long in our [Fijian] species); floral sheaths several-flowered, long-pedunculate; flowers pedicellate, actinomorphic, the segments subequal, connate proximally; filaments usually basally connate; style filiform, with simple branches; capsule globose, not more than 3 mm in diameter in our species."

Species:  "A flat-peduncled herb to 15 cm high, the perianth segments being yellow with brown markings and the capsule globose and small" (Smith, 1979; p. 177).

Habitat/ecology:  In Fiji, "sparsely naturalized in pastures at elevations of 750-800 m" (Smith, 1979; p. 177).

Propagation:  Seed

Native range:  South America (Smith, 1979; p. 177).

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 invasive	Orchard, Anthony E., ed. (1994) (p. 22) "A weed, scattered and frequent in cultivated ground and on wasteland". Vouchers cited: A.C. Beauglehole 5501 (CANB, MEL), R.B. Hoogland 8705 (CANB), A.C. Beauglehole 5502 (CANB, MEL)
Australia (Pacific offshore islands) Norfolk Islands	Norfolk Island	introduced invasive	Orchard, Anthony E., ed. (1994) (p. 11) "A weed, scattered and frequent in cultivated ground and on wasteland". Vouchers cited: P.S. Green 1363 (A), W. Laing (CHR)
Ecuador (Galápagos Islands) Isabela Group	Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Fiji Fiji Islands	Viti Levu Island	introduced invasive	Smith, Albert C. (1979) (p. 177) Voucher cited: Gillespie 3728
French Polynesia Austral (Tubuai) Islands	Rapa Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 6340 (PAP) Adventice
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 97)

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)	Guatemala (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Honduras (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)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
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
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island		McIntyre, Guy (1991) (p. 129)

Control:  If you know of control methods for Sisyrinchium micranthum, please let us know.