Pacific Island Ecosystems at Risk (PIER)

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Bouteloua disticha
(Kunth) Benth., Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Bouteloua pilosa (Hook. f.) Benth. ex S. Watson; Eutriana pilosa Hook. f.; Leptochloa hirta Nees ex Steud.; Polyodon distichus Kunth

Habit:  grass

Description:  "Annual; culms terete, glabrous, much branched, often decumbent and rooting from nodes, 25-80 cm long or more; sheaths shorter than internodes, glabrous or more or less papillose-pilose; ligule a fringe of hairs about 0.5 mm long; blades flat, elongate, mostly 2-5 mm wide, glabrous or somewhat pilose, margins scabrous; inflorescence with 15-30 branches, these mostly bearing 3-5 spikelets crowded on basal third of the flattened scabrous rachis; spikelets pale to purplish, 5-7 mm long excluding awns; first glume setaceous, 3-4 mm long, second lanceolate, scabrous, 4.5-6 mm long, apiculate or very short-awned from shallowly notched apex; lemma smooth, about equal to second glume, 3-nerved, nerves terminating in short awns; palea equaling lemma, the 2 nerves terminating in short awn points; rudiment including the strong scabrous central awn to 10 mm long, the body from greatly reduced to about 4 mm long, 2 short lateral awns often present (rudiment rarely lacking or reduced to scabrous awn about equaling lemma); caryopsis broadly fusiform, flattened, about 2.5 mm long, hilum punctiform, embryo large, covering about four-fifths of adaxial surface"  (Wiggins & Porter, 1971; pp. 832-834).

Description from GrassBase.

Habitat/ecology:  "A weedy species in tropical and subtropical areas" (Wiggins & Porter, 1971; pp. 832-834).

Propagation:  Seed

Native range:  Mexico through Central America to Ecuador and Peru (Wiggins & Porter, 1971; pp. 832-834).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Ecuador (Galápagos Islands)
Española Group
Española Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Española Group
Osborn Islet, Española Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Fernandina Group
Fernandina Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Floreana Group
Campéon Islet, Floreana Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Floreana Group
Floreana Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Isabela Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Alcedo, Isabela Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Cerro Azul, Isabela Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Darwin, Isabela Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Ecuador, Isabela Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Wolf, Isabela Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Pinta Group
Pinta Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Pinzón Group
Pinzón Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
San Cristóbal Group
San Cristóbal Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Baltra Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Edeén Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Punta Bowditch Norte Islet, Santa Cruz Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Seymour Norte Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Venecia Islet, Santa Cruz Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Fé Group
Santa Fé Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santiago Group
Albany Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santiago Group
Mao Islet, Santiago Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santiago Group
Rábida Island possibly introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santiago Group
Santiago Island possibly introduced
invasive
Charles Darwin Foundation (2008)
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)
El Salvador
El Salvador
El Salvador (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)

Comments:  Probably not native to the Galápagos Islands, possibly introduced, per Charles Darwin Research Station.


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This page was created on 5 JUL 2004 and was last updated on 30 NOV 2008.