Pacific Island Ecosystems at Risk (PIER)

  [   PIER species lists  ]   [   PIER home  ]

Eragrostis japonica
(Thunb.) Trin., Poaceae
Click on an image for links to BIGGER PICTURES


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Eragrostis elegans Nees; Eragrostis glomerata (Walter) L. H. Dewey; Eragrostis tenellula (Kunth) Steud.; Poa japonica Thunb.

Common name(s): [more details]

Chinese: luan cao

English: Japanese lovegrass, pond lovegrass

Japanese: kogome-kaze-kusa

Habit:  grass

Description:  "Caespitose annuals. Culms 25-100 (115) cm tall, erect, sometimes geniculate below, branching from the lower and middle nodes, glabrous and somewhat shiny below the nodes.  Sheaths overlapping below, about 3/4 to 7/8 as long as the internodes above, glabrous at the summit and along the upper margins.  Ligules 0.4-0.6 mm long, a delicate membrane, glabrous.  Blades (4) 15-20 (25) cm long, 1.5-6 mm wide, flat, glabrous below and scaberulous above, sometimes auriculate near the base.  Panicle 15-40 cm long, 0.8-5 cm wide, condensed, lanceolate, interrupted below, the ascending, often appressed branches 2-10 cm long, spreading up to 30 from the culm axis, the branches scaberulous and shiny, floriferous near base; pulvini in the axils of the primary branches glabrous; pedicels 0.5-1.5 mm long, erect and sinuous.  Spikelets 2.2-3.8 mm long, 0.8-1.3 mm wide, 4-12-flowered, oblong to narrowly lanceolate, compressed, yellowish-brown to somewhat whitish and hyaline; disarticulation between the florets, the portion of the rachilla and floret falling as a unit.  Glumes 0.6-1 mm long, ovate to ovate-lanceolate, subequal, faintly keeled, scaberulous along the keel,, hyaline, 1-nerved or the first often without a nerve.  Lemmas 0.9-1.2 mm long, ovate, hyaline, the lateral nerves conspicuous below, greenish, keeled, glabrous along the keel, apex acute.  Paleas 0.6-0.8 mm long, bowed out, hyaline, scaberulous along the keel near the apex, apex acute, often bifid.  Stamens 2, anthers 0.1-0.2 mm long, whitish to light brown.  Caryopses 0.3-0.4 mm long, obovoid, smooth, reddish-brown" (Lægaard & Peterson, 2001; p. 39).

Description from GrassBase.

Habitat/ecology:  In Ecuador, "occurs in moist areas along rivers and streams, usually in sandy soils below 100 m" (Lægaard & Peterson, 2001; p. 39).

Propagation:  Seed

Native range:  Tropical and subtropical Africa and Asia; exact native range obscure (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island)   Henty, E. E. (1969) (p. 93)
A weed of gardens, nursery beds, etc.
Philippines
Philippine Islands
Philippine Islands   Waterhouse, D. F. (1993) (p. 65)
Philippines
Philippine Islands
Philippine Islands   Merrill, Elmer D. (1925) (pp. 89-90)
In open wet grasslands, along streams, etc., at low and medium altitudes.
Solomon Islands
Solomon Islands
Solomon Islands native
Hancock, I. R./Henderson, C. P. (1988) (p. 71)
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
National Herbarium of New South Wales (2013)
As Eragrostis tenellula (Kunth) Steud. South Australia, Western Australia
Australia
Australia (continental)
New South Wales native
National Herbarium of New South Wales (2013)
As Eragrostis tenellula (Kunth) Steud.
Australia
Australia (continental)
Queensland native
National Herbarium of New South Wales (2013)
As Eragrostis tenellula (Kunth) Steud.
Cambodia
Cambodia
Cambodia (Kingdom of) 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)
Fields, roadsides, stream banks. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Henan, Hubei, Jiangsu, Jiangxi, Yunnan, Zhejiang.
China
China
Hong Kong native
Wu, Te-lin (2001) (p. 335)
In farmland and other wet places.
Costa Rica
Costa Rica
Costa Rica (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
El Salvador
El Salvador
El Salvador (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
Guatemala
Guatemala
Guatemala (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
Honduras
Honduras
Honduras (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
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)
Honshu, Kyushu, Shikoku
Japan
Ryukyu Islands
Ryukyu Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Malaysia
Malaysia
Malaysia (country of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
Perú
Perú
Perú (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
Taiwan
Taiwan Island
Taiwan Island native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Fields, roadsides, stream banks.
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)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Natualized


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

  [   PIER species lists  ]   [   PIER home  ]

This page was created on 30 MAY 2005 and was last updated on 25 APR 2013.