Pacific Island Ecosystems at Risk (PIER)

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Polytrias indica
(Houtt.) Veldkamp, Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Andropogon amaurus Büse; Polytrias amaura (Büse) Kuntze; Polytrias diversiflora (Steud.) Nash; Polytrias praemorsa (Nees) Hack.

Common name(s): [more details]

Chinese: dan xu cao

English: Java grass, Natewa blue grass

Habit:  grass

Description:  "Perennial grass branching from the base.  Culms erect to ascending, up to 40 cm or more in length, glabrous, rooting at the glabrous nodes.  Leaf sheath glabrous to finely pubescent; ligule a fimbriate membrane ca. 0.3-0.4 mm long.  Leaf blade linear, mostly 1.2-7 cm long, 1.5-3 mm wide, surfaces pilose, especially near the base; margins scabrous.  Inflorescence a narrow raceme 3.5-7 cm long, with spikelets in 3s, 2 sessile, and 1 stalked, rachis brown-hairy on the margins.  Spikelets laceolate 2.8-3.5 mm long, brown.  Glumes as long as the spikelet, 2- or 3-grooved or nerved, setose.  Lower lemma absent, upper less than half as long as the spikelet, bearing a twisted, bent, pubescent awn 6-10 mm long.  Distinguishable by its creeping grass habit, hairy leaf surfaces, small erect, narrow brown racemes with spikelets in 3s (two sessile and one stalked), and bent, twisted awn borne on the glume"  (Whistler & Steele, 1999; p. 88).

Description from GrassBase.

Habitat/ecology:  In Fiji, "roadsides and plantations... It is becoming moderately common from sea leavel to about 30 m. It is reported to be a useful lawn grass" (Smith, 1979; p. 368). In Kwajalein, Marshall Islands, "scattered patches in lawns" (Whistler & Steele, 1999; p. 88).

Propagation:  Seed

Native range:  Southeastern Asia (Smith, 1979; p. 368).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Commonwealth of the Northern Mariana Islands (US)
Northern Mariana Islands
Rota Island native
Raulerson, L. (2006) (p. 11)
Commonwealth of the Northern Mariana Islands (US)
Northern Mariana Islands
Tinian Island native
Raulerson, L. (2006) (p. 11)
Fiji
Fiji Islands
Vanua Levu Island introduced
invasive
Smith, Albert C. (1979) (p. 368)
Vouchers cited: DA 11905, Vouchers cited: DA 8784, CA 8323, DA 8469, DA 11906
Fiji
Fiji Islands
Viti Levu Island introduced
invasive
Smith, Albert C. (1979) (p. 368)
Vouchers cited: DA 8784, DA 8323, DA 8469
Guam
Guam Island
Guam Island native
Stone, Benjamin C. (1970) (p. 237)
Guam
Guam Island
Guam Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 56)
Voucher cited: Moore 287
Marshall Islands
Ralik Chain
Kwajalein (Kuwajleen) Atoll introduced
invasive
Whistler, W. A./Steele, O. (1999) (p. 88)
Voucher cited: Whistler 11223
Palau
Palau (Belau ) (main island group)
Babeldaob Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 56)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 56)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
China
China
China (People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
Hong Kong introduced
cultivated
Wu, Te-lin (2001) (p. 345)
On stony slopes.
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Thailand
Thailand
Thailand (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam
Vietnam
Vietnam (Socialist Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


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This page was created on 24 NOV 2006 and was last updated on 30 NOV 2008.