Pacific Island Ecosystems at Risk (PIER)

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Polypogon viridis
(Gouan) Breistr., Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Agrostis semiverticillata (Forssk.) C. Chr.

Common name(s): [more details]

Chinese: tai lü bang tou cao

English: beardless rabbitsfoot grass, water bent

French: agrostide demi-verticillée

Habit:  grass

Description:  "Perennials; culms strongly decumbent at base and rooting at nodes, (1.5-) 3-6 (-8) dm long.  Sheaths smooth, broad; ligule 1.5-4 (-6) mm long, truncate, erose-ciliolate and somewhat lacerate; blades flat, relatively wide, (1.5-) 2.5-4 (-7) mm long, upper surface smooth or scabrous.  Inflorescences paniculate, (2-) 4-10 (-16) cm long, compact, interrupted, the branches ascending to erect, spikelet-bearing to base; spikelets slightly laterally compressed, rachilla not prolonged; glumes small, subequal, (1.2-) 1.5-1.8 (-2) mm long, 1-nerved, densely and evenly scabrous, first glume ovate, second glume lanceolate; lemma membranous, 0.8-1.2 mm long, awnless, minutely apiculate by the excurrent nerves, callus blunt and glabrous; palea 0.5-1 mm long.  Caryopsis brown, cylindrical, 0.7-1 mm long, ca. 0.3 mm wide"  (Wagner et al., 1999; p. 1494).

Description from GrassBase.

Habitat/ecology:  In Hawai‘i, "naturalized in moist places, especially along steams, irrigation ditches, and seepage areas, 160-1,220 m"  (Wagner et al., 1999; p. 1494).

Propagation:  Seed

Native range:  "Native range unknown, occurring throughout the Old World tropics and in the Americas from Texas to Argentina" (Wagner et al., 1999; p. 1494). Macaronesia, northern Africa, Europe, western and central Asia; naturalized elsewhere (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1494)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1494)
Vouchers cited: Knudsen s.n. (B), Mann & Brigham 273 (B)
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)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 124)
China
China
China (People's Republic of)   Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Aquatic grass rooting in sand and mud of streams, marshy grasslands; ca. 2600 m. Yunnan.
Mexico
Mexico
Mexico (United Mexican States)   Hafliger, Ernst/Scholz, Hildemar (1980) (p. 124)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Edgar, E./Connor, H. (2000) (p. 289)
"Lowland in waste ground, roadsides and edges of ditches, often in damp places, occasionally a garden weed".


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

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This page was created on 10 FEB 2007 and was last updated on 30 NOV 2008.