Pacific Island Ecosystems at Risk (PIER)

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Bromus hordeaceus
L., Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Bromus mollis L.

Common name(s): [more details]

Chinese: mao que mai

English: barley brome, common soft brome, least soft brome, lop grass, sand soft brome, soft brome, soft chess

French: brome mou

Spanish: bromo blando, bromo suelto

Habit:  grass

Description:  "Annuals; culms 1.5-6.5 (-10) dm tall, glabrous or pubescent, sometimes only on nodes.  Sheaths soft pubescent; ligule 0.5-2 mm long, finely erose-ciliate, pubescent or sometimes glabrous; blades flat, relatively narrow, 1.5-4 mm wide, sometimes involute, upper surface glabrous, lower surface with scattered hairs, auricles absent.  Inflorescences paniculate, crowded, erect, 3-8 (-10) cm long, pedicels usually shorter than spikelets; spikelets 5-10 (-12)-flowered, (11-) 14-20 (-23) mm long, soft pubescent to glabrous; first glume lanceolate, 5-7.5 mm long, 3-5-nerved, second glume ovate to lanceolate, 6-8.5 mm long, 5-7-nerved; lemmas 7-9 (-10) mm long, 1.5-2.5 mm wide in side view, somewhat flattened, nerves relatively prominent, apex bifid, the teeth usually less than 2 mm long; awns 4-9 mm long, usually straight; palea about as long as lemma, 2-nerved, ciliate on the nerves, delicately membranous, adhering to caryopsis.  Caryopsis dark brown, flattened, slightly curved, thin, linear to oblong, 5-6 mm long, 1-1.5 mm wide"  (Wagner et al., 1999; pp. 1507-1508).

Description from GrassBase.

Habitat/ecology:  In Hawai‘i, "naturalized in disturbed, often dry areas such as pastures and along roadsides and trails, 610-2290 m"  (Wagner et al., 1999; p. 1508).

Propagation:  Seed

Native range:  Old World (Wagner et al., 1999; p. 1508).

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 weedy grass native to Europe and western Asia". Voucher cited: A.C. Beauglehole 5429 (CANB, MEL)
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island introduced
invasive
Orchard, Anthony E., ed. (1994) (p. 12)
"A weedy grass native to Europe and western Asia". Vouchers cited: P.S. Green 1508 (A, K), W.R. Sykes 766/87 (CHR), E. Ralston 49 (CHR)
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
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
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)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1507-1508)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1507-1508)
Voucher cited: Rock 5128 (BISH)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1505-1506, 1507-1508, 1905)
Also subsp. molliformis (Lloyd) Maire & Weiler; voucher cited: Lee 288 (BISH)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Wysong, Michael/Hughes, Guy/Wood, K. R. (2007) (p. 6)
Ssp. hordeaceus. Voucher cited: K.R. Wood & Hughes 10600.001 (PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1505-1506, 1507-1508, 1905)
Also subsp. molliformis (Lloyd) Maire & Weiler
New Zealand (offshore islands)
Kermadec Islands
Kermadec Islands introduced
invasive
Edgar, E./Connor, H. (2000) (p. 363)
"Roadsides and waste land".
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
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Chile (continental)
Chile
Chile (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
China
China
China (People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Gansu, Hebei, Qinghai, Xinjiang.
Mexico
Mexico
Mexico (United Mexican States) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Edgar, E./Connor, H. (2000) (p. 363)
"Roadsides and waste land".
Taiwan
Taiwan Island
Taiwan Island native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
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
Canada (except British Colombia)
Canada
Canada (country) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
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 10 FEB 2007 and was last updated on 30 NOV 2008.