Paspalum urvillei Steud., Poaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Reject, score: 13 (Go to the risk assessment).

Common name(s): [more details]

Chinese: si mao que bai

English: Vasey grass

French: herbe cheval, herbe de Vasey, paspalum d'Urville, paspalum géant

Maori (Cook Islands): tinikarāti

Spanish: hierba de Vasey, paja boba, paja mansa, pasto macho

Habit:  grass

Description:  "Densely tufted robust perennial [grass]; culms 1-2 m tall, erect, glabrous, basally thickened; sheaths carinate upwards, lower ones pubescent, purplish; upper ones glabrous, green, 8-27 cm long; ligule very conspicuous (3-) 5-8 (-12) mm long, membranous; blades linear, acute, 12-55 cm long, 4-15 mm wide, flat, hairy at base; panicles 10-40 cm long, of 6-25 crowded racemes, these erect or ascending, 5-13 cm long, apical ones shorter than basal ones; spikelets paired, on rachises about 0.8 mm wide, elliptic ovate, broad, subacute, 2-3 mm long; glume and sterile lemma subequal, slightly apiculate, thin, ovate, 3-nerved, green to greenish-purple, pilose-ciliate; fertile lemma 1.6 mm long" (Stone, 1970; p. 217).

Description from GrassBase.

Habitat/ecology:  A weed of disturbed areas.  Grows up to 1000 m in elevation in New Caledonia.  In Hawai‘i, grows in dense stands in mesic areas along forest roads, trails and open disturbed areas at low to mid-elevations, where it displaces native vegetation (Motooka et al., 2003); "naturalized along ditches and roadsides and in fields, pastures, and other disturbed, usually mesic areas, 20-1,280 m"  (Wagner et al., 1999; p. 1577). In New Caledonia, "maintenant largement répandu, notamment en bords de pistes forestières (même en terrain serpentineux) où il atteint 1000 m d'altitude" (MacKee, 1994; p. 61).

Propagation:  Seed

Native range:  Tropical America but widely introduced in tropical countries.

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
American Samoa Manu‘a Islands	Ta‘u Island	introduced invasive	Space, James C./Flynn, Tim (2000) (p. 47)
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1990) (voucher ID: PTBG 9101) Taxon name on voucher: Paspalum urvillei
American Samoa Tutuila Islands	Tutuila Island	introduced invasive	Space, James C./Flynn, Tim (2000) (p. 37)
American Samoa Tutuila Islands	Tutuila Island		Bishop Museum (Honolulu) (1972) (voucher ID: BISH 83841) Taxon name on voucher: Paspalum urvillei Steud.
American Samoa Tutuila Islands	Tutuila Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1994) (voucher ID: PTBG 26893) Taxon name on voucher: Paspalum urvillei Steud.
Commonwealth of the Northern Mariana Islands (US) Saipan	Saipan Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 55)
Cook Islands Southern Cook Islands	Mangaia Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Rarotonga Island		Sykes, Bill (year unknown)
Fiji Fiji Islands	Viti Levu Island		Bishop Museum (Honolulu) (1955) (voucher ID: BISH 31623) Taxon name on voucher: Paspalum urvillei Steud.
Fiji Fiji Islands	Viti Levu Island		Bishop Museum (Honolulu) (1955) (voucher ID: BISH 31624) Taxon name on voucher: Paspalum urvillei Steud.
Fiji Fiji Islands	Viti Levu Island		Bishop Museum (Honolulu) (1927) (voucher ID: BISH 126260) Taxon name on voucher: Paspalum urvillei Steud.
Guam Guam Island	Guam Island	introduced cultivated	Stone, Benjamin C. (1970) (p. 217)
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 55)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1577)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1577)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1577)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1577)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1577)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1577)
Japan (offshore islands) Ogasawara (Bonin) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007)
New Caledonia New Caledonia	New Caledonia Islands	introduced invasive	Meyer, Jean-Yves (2000) (p. 100) "Up to 1000 m elev."
New Caledonia New Caledonia	New Caledonia Islands	introduced invasive cultivated	Gargominy, Oliver/Bouchet, Philipe/Pascal, Michel/Jaffre, Tanguy/Tourneu, Jean-Christophe (1996) (p. 381) Largement répandue, notamment au bord des pistes forestières (même en terrain serpentineux), atteint 1000 m d'altitude.
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced invasive	MacKee, H. S. (1994) (p. 61) Voucher cited: Barrau in Baumann 7381
New Zealand (offshore islands) Kermadec Islands	Kermadec Islands	introduced invasive	Edgar, E./Connor, H. (2000) (p. 569) "Usually roadsides, sometimes in large patches; also waste land, manuka scrub".
New Zealand (offshore islands) Kermadec Islands	Raoul Island	introduced invasive	Sykes, W. R./West, C. J. (1996) (p. 452)
Philippines Philippine Islands	Philippine Islands		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 107)
United States (other Pacific offshore islands) Midway Atoll	Sand Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-11)

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. 107)
China China	China (People's Republic of)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 107)
China China	Hong Kong	introduced invasive	Wu, Te-lin (2001) (pp. 342-343) In wasteland.
Indonesia Indonesia	Indonesia (Republic of)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 107)
Japan Japan	Japan	introduced	Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 192)
Mexico Mexico	Mexico (United Mexican States)		Hafliger, Ernst/Scholz, Hildemar (1980) (p. 107)
New Zealand New Zealand	New Zealand (country)	introduced invasive	Edgar, E./Connor, H. (2000) (p. 569) "Usually roadsides, sometimes in large patches; also waste land, manuka scrub".
South America (Pacific rim) South America (Pacific rim)	Chile (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam Vietnam	Vietnam (Socialist Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 269)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island		McIntyre, Guy (1991) (p. 109)

Comments:  A problem species in Hawai‘i.

Control: 

Chemical: "Sensitive to glyphosate and imazapyr. On Kaua‘i, drizzle applications of glyphosate at 0.5 lb/acre suppressed vasey grass on Nu‘alolo Crossover Trail for 6 months. On the Alaka‘i Swamp Trail suppression by the same method was excellent and follow-up treatments required very little glyphosate at 6 and 12 months after treatment" (Motooka et al., 2003).