Pacific Island Ecosystems at Risk (PIER)

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Avena barbata
Pott ex Link, Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: barbed oat, bearded oat, slender oat, slender wildoat, Yatheroo oat

French: avione barbue, avoine à deux barbes

Spanish: avena barbada, balango, ballueca, cebada de perro, cebadilla

Habit:  grass

Description:  "Tufts green to dark green, often very slender, 65-100-(170) cm, erect or drooping above in taller plants. Leaf-sheath smooth, or slightly scabrid above, occasionally red-tinged. Ligule 2.7-5-(9) mm, obtuse, denticulate, abaxially finely scabrid. Leaf-blade 12.5-30 cm x 2-8 mm, finely scabrid on ribs and margins. Culm internodes glabrous. Panicle (12)-18-40 cm, very lax, equilateral; rachis smooth, branches and pedicels very filiform, finely scabrid. Spikelets 40-50 mm, 2-(3)-flowered; disarticulation below each floret at maturity. Glumes 7-9-nerved. Lemma 12-18 mm, narrow-lanceolate, light brown, with long stiff reddish hairs below level of awn insertion, green and scabrid above, each lobe-tip produced to a fine bristle (2-3 mm); lemmas awned, awns 30-36 mm, geniculate, column very dark brown, twisted. Palea keels with 1-2 rows of cilia, interkeel glabrous, flanks sometimes sparsely scabrid. Callus long hairy, with horse-shoe shaped scar. Rachilla long hairy. Anthers 2-3 mm. Caryopsis 5-7 x 0.8-1.3 mm, light brown, silky hairy" (Edgar & Connor, 2000; p. 302).

Description from GrassBase.

Habitat/ecology:  In New Zealand, "near the sea, especially on cliffs, dry banks, and steep grassy slopes, occasionally inland on disturbed ground, roadsides and in pasture"  (Edgar & Connor, 2000; p. 302).

Propagation:  Seed

Native range:  Macaronesia, northern Africa, Europe, Asia; also cultivated and naturalized (GRIN).

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. 11)
"A weed of disturbed soil". Voucher cited: R.D. Hoogland 8657 (CANB)
Chile (offshore islands)
Juan Fernández Islands
Isla Más a Tierra (Robinson Crusoe Island) introduced
Skottsberg, Carl (1953) (p. 215)
Very common in the basal region, abundant in the dry western parts.
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. 551)
Chile (offshore islands)
Juan Fernández Islands
Isla Más Afuera (Alejandro Selkirk Island) introduced
Skottsberg, Carl (1953) (p. 215)
East coast.
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. 551)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
Skottsberg, Carl (1953) (p. 215)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Atkinson, Rachel/Sawyer, John (2011)
Chile (offshore islands)
Juan Fernández Islands
Isla Santa Clara introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 551)
Chile (offshore islands)
Juan Fernández Islands
Morro El Verdugo introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 551)
Chile (offshore islands)
Juan Fernández Islands
Morro Juanango introduced
invasive
Danton, Philippe/Perrier, Christophe/Martinez Reyes, Guido (2006) (p. 551)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Staples, George W./Imada, Clyde T./Herbst, Derral R. (2002) (p. 13)
Voucher cited: L. W. Cuddihy 238 (BISH)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1499)
Voucher cited: Hitchcock 13934 (US)
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) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Chile (continental)
Chile
Chile (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 192)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Edgar, E./Connor, H. (2000) (p. 302)
Perú
Perú
Perú (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
United States (west coast)
United States (west coast states)
USA (Oregon) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (California) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (Washington) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


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This page was created on 12 FEB 2007 and was last updated on 1 MAR 2013.