Pacific Island Ecosystems at Risk (PIER)

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Oryza rufipogon
Griff., Poaceae
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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: ye sheng dao

English: brownbeard rice, red rice, wild red rice

French: riz rouge sauvage

Spanish: arroz colorado, arroz roja

Habit:  grass

Description:  "A rhizomatous perennial [with] erect to trailing culms which can reach 4.0 m in length.  Leaf sheaths are smooth to somewhat scabrous distally.  The membranous ligule is often lobed and up to 4.3 cm long.  Auricles, 1.0 mm wide at the base, 0.3 mm wide at the tip, and 8.0 mm in length, are usually present.  Leaf blades are up to 2.5 cm wide and 78 cm long.  Inflorescences are up to 33 cm long.  Spikelets are 8.0 to 9.6 mm long and have awns 3.0 to 5.0 cm long.  The individual seeds on an inflorescence ripen at different times and fall over a period of several weeks" (Vandiver et al., 1992).

Description from GrassBase.

Habitat/ecology:  "It occurs in ponds, ditches and other places with stagnant or slow-moving water.  It often grows side by side with cultivated rice, and closely resembles it in vegetative characters" (Holm et al., 1997; p. 536).  Wet areas; particularly a weed of rice (Vandiver et al., 1992).

Propagation:  Seed, rhizomes (Vandiver et al., 1992).

Native range:  Asia, Australia (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) native
Henty, E. E. (1969) (p. 136)
Grows as a weed in ricefields and bybridizes freely with cultivated rice; since the grain sheds early, it is difficult to eradicate.
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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)
Northern Territory native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia
Indonesia
Indonesia (Republic of)   Waterhouse, D. F. (1993) (pp. 67, 78)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan
Taiwan Island
Taiwan Island native
U.S. Dept. Agr., Agr. Res. Serv. (2013)

Comments:  Reported to be an invasive plant in southeast Asia (Barbara Waterhouse, pers. com.).

Control:  Controlling invasive wild rice with ACCase-inhibiting herbicides


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 30 MAY 2005 and was last updated on 31 DEC 2011.