Sporobolus elongatus R.Br., Poaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: rat-tail dropseed, wire grass

Habit:  grass

Description:  "Tufted perennial [grass], with erect glabrous culms up to 90 cm high.  Sheaths glabrous; blades flat or somewhat involute, 10-20 cm long, 3-6 mm wide.  Panicle spikelike, up to 30 cm long or more, dull lead-colored, the lower branches appressed, the upper ones ascending, densely contracted.  Spikelets about 1/32-1/16 in long, densely crowded.  Lower glume 1/4 as long as floret; upper glume 1/2 as long as floret.  Lemma and palea equal.  Seed reddish-brown"  (Stone, 1970; p. 193).

Description from GrassBase.

Habitat/ecology:  In Fiji, "from sea level to about 600 m along roadsides and in waste places, on open hillsides, along riverbanks, and in plantations and cultivated fields".  A weed that is difficult to eradicate (Smith, 1979; pp. 308-309).

Propagation:  Seed

Native range:  Australia and Indo-Malesia into Polynesia (Smith, 1979; pp. 308-309).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Fiji Fiji Islands	Lakemba Island	native	Smith, Albert C. (1979) (pp. 308-309)
Fiji Fiji Islands	Matuku Island	native	Smith, Albert C. (1979) (pp. 308-309)
Fiji Fiji Islands	Ovalau Island	native	Smith, Albert C. (1979) (pp. 308-309) Vouchers cited: DA 1346, DA 1364
Fiji Fiji Islands	Taveuni Island	native	Smith, Albert C. (1979) (pp. 308-309) Vouchers cited: DA 8894, DA 8915, DA 5737
Fiji Fiji Islands	Vanua Levu Island	native	Smith, Albert C. (1979) (pp. 308-309) Vouchers cited: DA 5702, DA 8953
Fiji Fiji Islands	Vanua Mbalavu Island	native	Smith, Albert C. (1979) (pp. 308-309) Voucher cited: DA 10235
Fiji Fiji Islands	Viti Levu Island	native	Smith, Albert C. (1979) (pp. 308-309) Vouchers cited: DA 9796, DA 8172, DA 8150, DA 9033, DA 7988, DA 8045, DA 7704
Guam Guam Island	Guam Island	introduced invasive	Stone, Benjamin C. (1970) (p. 193) Voucher cited: Necker 401
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Snow, Neil (2008) (p. 41) Voucher cited: E. J. Funk s.n. (BISH 614547)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Herbst, Derral R./Clayton, W. D. (1998) (p. 36) Present status unknown. Voucher cited: Munro 706 (BISH)
State of Hawaii Hawaiian Islands	Maui Island	introduced	Wester, Lyndon (1992) (p. 123)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Snow, Neil (2008) (p. 41) Voucher cited: B. C. Stone 1234 (BISH)
New Caledonia New Caledonia	New Caledonia Islands		Swarbrick, John T. (1997) (p. 97)
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)		Henty, E. E. (1969) (p. 180) Collections identified as this species.
Pitcairn Islands Pitcairn Islands	Pitcairn Island	introduced	St. John, H. (1987) (p. 24) Voucher cited: Fosberg & B. Christian 11179
Solomon Islands Solomon Islands	Russell (Pavuvu) Island		Burcham, L. T. (1948) (p. 425) Pavuvu Island. Voucher cited: Burcham 187 (US)
Solomon Islands Solomon Islands	Solomon Islands		Swarbrick, John T. (1997) (p. 97)
Solomon Islands Solomon Islands	Solomon Islands	native	Hancock, I. R./Henderson, C. P. (1988) (p. 110)
Vanuatu New Hebrides Islands	Vanuatu (Republic of)		Swarbrick, John T. (1997) (p. 97)

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)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Edgar, E./Connor, H. (2000) (p. 532) "Rough pasture and on roadside".

Control:  If you know of control methods for Sporobolus elongatus, please let us know.