Avena fatua L., Poaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: ye yan mai

English: common wild oat, flaxgrass, oatgrass, spring wild oat, wheat oats, wild oat

French: avéron, avoine folle, avoine sauvage, folle avoine

Japanese: cha-hiki, karasu-mugi

Spanish: avena guacha, avena loca, avena negra, avena silvestre, avenilla, balango

Habit:  grass

Description:  "Stout annuals; culms (2.5-) 4.5-9 (-19) dm tall.  Sheaths glabrous, smooth, with margins overlapping and eventually spreading; ligule 2-5.5 (-7) mm long, obtuse, erose-ciliate, often pubescent; blades flat, 3-10 (-15) mm wide, scabrous to somewhat pilose.  Inflorescences paniculate, 10-25 (-38) cm long, open; spikelets 2-3 (4)-flowered, rachilla densely pubescent, readily disarticulating above glumes and between florets; glumes prominently (7-) 9-11-nerved, first glume narrowly lanceolate, 19-26 (-29) mm long, apex acuminate, second glume lanceolate, 20-28 (-30) mm long, apex acuminate; lemmas 14-20 (-23) mm long, 5-7-nerved, the nerves often obscure on the glossy, indurate lower 1/2, glabrous to moderately pilose, bilobed , the lobes less than 1 mm long, callus usually densely pilose, awns usually only on first 2 florets, (18-) 28-45 (-52) mm long, stout, tightly twisted below the knee, tapering above; palea firm, the keels ciliate.  Caryopsis pale brown, linear-lanceoloid, ca. 6 mm long, appressed pubescent"  (Wagner et al., 1999; p. 1499).

Description from GrassBase.

Habitat/ecology:  "Grass- and woodland, riparian habitats, coastal sand dunes and beaches.  A grass that prefers temperate and cool climates, and grows best in moist soils.  The grass forms dense swards that displace native grass and forb species"  (Weber, 2003; p. 63).

In Hawai‘i, "common to occasional in pastures and along roadsides, 150-1,280 m"  (Wagner et al., 1999; pp. 1499-1500).

Propagation:  Seed

Native range:  "Eurasia and northern Africa, introduced into southern Africa, Australia, New Zealand and the New World"  (Wagner et al., 1999; p. 1499).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1499-1500)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1499-1500)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1499-1500)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1499-1500)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1499-1500) Voucher cited: Hitchcock 13749 (US)
Philippines Philippine Islands	Philippine Islands	introduced	Merrill, Elmer D. (1925) (p. 83) Probably merely a casual here, altitude about 1,500 m.
Philippines Philippine Islands	Philippine Islands		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 40)

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)	Australia (continental)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 24)
China China	China (People's Republic of)	introduced invasive	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) "Weed of cultivated fields, grassy mountain slopes, roadsides and other disturbed places; below 4300 m".
China China	Hong Kong	introduced invasive cultivated	Wu, Te-lin (2001) (p. 323) On farmlands and abandoned lands.
Indonesia Indonesia	Indonesia (Republic of)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 24)
Japan Japan	Japan	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 192) Also var. glabrata Peterm.
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)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 24)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Edgar, E./Connor, H. (2000) (p. 303) "A problem weed of crops, on roadsides and waste land and also in brackish soil and reclamation areas".
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 24)
South America (Pacific rim) South America (Pacific rim)	Colombia		Hafliger, Ernst/Scholz, Hildemar (1980) (p. plate)
Taiwan Taiwan Island	Taiwan Island	introduced invasive	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) "Weed of cultivated fields, grassy mountain slopes, roadsides and other disturbed places; below 4300 m".

Control: 

Physical:  "Plants normally do not reproduce from vegetative parts, and mechanical removal may control the plant. Burning can reduce the number of seeds on or near the soil surface".

Chemical:  "Emerging seedlings can be killed by soil-applied herbicides such as trifluralin, barban or asulam"  (Weber, 2003; p. 63).