Pacific Island Ecosystems at Risk (PIER)

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Isachne globosa
(Thunb.) Kuntze, Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Reject, score: 18 (Go to the risk assessment)

Common name(s): [more details]

Chinese: liu ye ruo

English: swamp millet

Habit:  grass

Description:  "Annual or short-lived perennial; culms 5-60 cm tall, erect or decumbent and rooting at the lower nodes, the internodes cylindrical, hollow, glabrous, the nodes glabrous or pilose.  Sheaths rounded, usually glabrous, one margin ciliate, the collar usually glabrous, sometimes pubescent; ligule 1-3 mm long; blades 2-8 cm long, 4-14 mm wide, lanceolate to ovate-lanceolate, flat, acuminate, scabrous, sometimes pubescent on one or both surfaces, the margin scabrous. Panicle 3-12 cm long, the branches ascending to widely spreading, glabrous or scabrous, the pedicels with glandular spots or bands, the pulvini glabrous.  Spikelets 1.8-2.5 mm long, subglobose, obtuse, green or purplish; lower glume 1.6-2.4 mm long, ovate, obtuse, (5)-7-9 nerved, usually scabrous in the upper half sometimes with a few setae, the margin broadly hyaline; upper glume 1.4-2.1 mm long, slightly shorter than the lower, nearly orbicular, obtuse to emarginate, 7-11-nerved, usually scabrous in the upper half, the margin broadly hyaline; lower floret staminate, nearly membranous, 1.8-2.6 mm long, 0.9-1.3 mm wide, distinctly longer than the upper floret, broadly elliptic, glabrous, grooved on the back; upper floret pistillate, indurate, 1.4-2.4 mm long, 0.9-1.3 mm wide, broadly elliptic to ovate-elliptic, densely puberulent, stigmas purple; anthers 1.2-1.8 mm long; caryopsis suborbicular in outline, plano-convex, 1.0-1.1 mm long, 0.9-1.0 mm wide, dark reddish brown" (Dassanayake, 1994; pp. 265-266).

"Semiprostrate, with erect flowering culms 15-90 cm high; sheaths fairly loose, the leaf blades tapering to a rounded apex, the margins scabrous; panicle compact, 6-8 cm long, the racemes 6-18 mm long; spikelets rounded, the glumes ciliate along margins and nerves" (Smith, 1979; pp. 364-365).

Description from GrassBase.

Habitat/ecology:  In Fiji, "noted at only two localities at very diverse elevations, 800 m and sea level respectively.  At the higher elevation the species was found in open, sunny, swampy ground near a creek" (Smith, 1979; pp. 364-365).  In Sri Lanka, "in marshy habitats, rice fields, stream banks, ditches, from sea level to 1,800 m elevation" (Dassanayake, 1994; pp. 265-266).

Propagation:  Seed

Native range:  Eastern Asia (Smith, 1979; pp. 364-365). Fosberg et al. (1987; p. 45) list as native in Micronesia.

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Federated States of Micronesia
Chuuk Islands
Dublon (Tonowas) Island native
Fosberg, F. R./Sachet, M.-H. (1982) (p. 54)
Var. ciliaris Ohwi; vouchers cited: Hatusima 10710 (FU, isotype), Hosaka 2759 (US, BISH, POM, K, MO, CANB, L)
Federated States of Micronesia
Pohnpei Islands
Pohnpei Island native
Herrera, Katherine/Lorence, David H./Flynn, Timothy/Balick, Michael J. (2010) (p. 58)
Vouchers cited: S.F. Glassman 2741 (BISH), T. Hosokawa 5982 (BISH), M. Takamatsu 1084 (BISH)
Federated States of Micronesia
Yap Islands
Yap (Waqab) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 45)
Federated States of Micronesia
Yap Islands
Yap (Waqab) Island native
Fosberg, F. R./Sachet, M.-H. (1982) (p. 54)
Voucher cited: Kanehira & Hatusima 4353 (KYO)
Fiji
Fiji Islands
Viti Levu Island introduced
invasive
Smith, Albert C. (1979) (pp. 364-365)
Vouchers cited: Greenwood 1178, DA 7597
Palau
Palau (Belau ) (main island group)
Babeldaob Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 45)
Palau
Palau (Belau ) (main island group)
Babeldaob Island native
Fosberg, F. R./Sachet, M.-H. (1982) (p. 54)
Vouchers cited: Hosokawa 7387 (US), Kanehira & Hatusima 4548 (KYO)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 45)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Fosberg, F. R./Sachet, M.-H. (1982) (p. 54)
Voucher cited: Kanehira & Hatusima 4429 (KYO)
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) native
Henty, E. E. (1969) (p. 114)
Common on wet soil in grassland, garden clearings, etc., from about 3000 to 7000 ft.
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands native
Merrill, Elmer D. (1925) (p. 59)
In swamps about Lake Lanao, altitude about 650 m.
Solomon Islands
Solomon Islands
Solomon Islands   Swarbrick, John T. (1997) (p. 93)
Solomon Islands
Solomon Islands
Solomon Islands native
Hancock, I. R./Henderson, C. P. (1988) (p. 83)
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)
South Australia, Victoria
Australia
Australia (continental)
New South Wales native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Northern Territory native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Wet places, forming colonies, and as a weed of rice fields. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Liaoning, Shaanxi, Shandong, Yunnan, Zhejiang.
China
China
Hong Kong native
Wu, Te-lin (2001) (p. 339)
On grasslands.
Indonesia
Indonesia
Indonesia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan
Japan
Japan (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Hokkaido, Honshu, Kyushu, Shikoku
Japan
Ryukyu Islands
Ryukyu Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
North Korea
North Korea
North Korea (Democratic People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
South Korea
South Korea
South Korea (Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Edgar, E./Connor, H. (2000) (p. 596)
"Edges of swamps and lake margins, often partly submerged, sometimes in deep gullies, coastal".
Singapore
Singapore
Singapore (Republic of)   Waterhouse, D. F. (1993) (p. 66)
Singapore
Singapore
Singapore (Republic of) uncertain if introduced
invasive
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 51)
Weed of uncertain origin
Taiwan
Taiwan Island
Taiwan Island native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Wet places, forming colonies, and as a weed of rice fields.
Thailand
Thailand
Thailand (Kingdom of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Vietnam
Vietnam
Vietnam (Socialist Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)


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This page was created on 1 JAN 1999 and was last updated on 30 NOV 2008.