Pacific Island Ecosystems at Risk (PIER)

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Eriochloa polystachya
Kunth, Poaceae
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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Other Latin names:  Eriochloa subglabra (Nash) Hitchc.; Monachne subglabra Nash

Common name(s): [more details]

English: Carib grass, Caribbean cup grass

Spanish: yerba de Caribe

Habit:  grass

Description:  "Aquatic perennial, creeping grass 5-150 cm tall.  Stems terete or slightly compressed with a central air cavity.  Leaf sheaths ribbed, apically keeled; nodes densely and finely hairy; ligule a fringe of hairs; leaf blade linear, 6-25 cm - 6-15 mm, flat, with an acute apex and scabrous margins.  Inflorescence an erect terminal panicle, 12-24 cm long, with 6-15 pseudo-spikes.  Lower pseudo-spikes 6-15 cm long, shortening upwards to 2.5-4 cm long.  Spikelets hairy, 2-3.8 mm long, with a marked basal swelling; flowers 1 or 2; spikelets shed as a whole when mature."  (Waterhouse & Mitchell, 1998; pp. 73-74).

Description from GrassBase.

Habitat/ecology:  "Swamps, deep-water rice fields, river banks, drains and ditches on heavy soils. Tolerates strong to medium dry seasons. Rear of coastal dunes to 500 m altitude. Noxious in deeply inundated rice fields where dense growth suppresses other vegetation." (Waterhouse & Mitchell, 1998; pp. 73-74).

Propagation:  "Seeds (where produced) and vegetative fragments dispersed by water" (Waterhouse & Mitchell, 1998; pp. 73-74).

Native range:  Tropical America (Waterhouse & Mitchell, 1998; pp. 73-74).

Presence:

Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Colombia
Colombia
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indonesia
Indonesia
Indonesia (Republic of)   Waterhouse, B. M./Mitchell, A. A. (1998) (p. 74)
Java, Tanimbar Island
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Thailand
Thailand
Thailand (Kingdom of)   Waterhouse, B. M./Mitchell, A. A. (1998) (p. 74)
Vietnam
Vietnam
Vietnam (Socialist Republic of)   Waterhouse, B. M./Mitchell, A. A. (1998) (p. 74)
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
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Texas
Naturalized
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized

Comments:  "A serious weed in Mexico" (Waterhouse & Mitchell, 1998; pp. 73-74).


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

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This page was created on 14 MAR 2005 and was last updated on 30 NOV 2008.