Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Other Latin names:  Schoenoplectus grossus (L. f.) Palla; Scirpus grossus L. f.

Common name(s): [more details]

Chinese: da biao cao

Habit:  sedge

Description:  "Perennial; stolons slender, about 5 mm thick.  Culms 1 to few to a tuft, 1-2 m tall, 2-2.5 cm thick at base, 0.7-1 cm thick below the inflorescence, sharply 3-angled, spongy, faces concave, septate-nodose, smooth, with a corm-like hard enlargement at base.  Leaves few to a culm, linear, 1.5-3 cm wide, mostly equaling the culm, 1-ribbed, flattish-plicate, somewhat thickish, soft, septate-nodose, gradually attenuate upward, sheaths spongy, prominently septate-nodose, tightly surrounding culm base.  Inflorescence a large terminal corymb with primary, secondary and tertiary rays; rather dense, 6-15 cm long and as broad; bracts 3-4, leaf-like, exceeding the inflorescence, the longest up to 50 cm long; rays many, somewhat compressed, scabrous on edges as in secondary rays; bractlets spathaceous-scale-like, about 8 mm long, brownish-stramineous; secondary rays slender, 1.5-4 cm long.  Spikelets solitary, pedicellate and in the terminal one sessile, ellipsoid to long-ellipsoid, 6-10 mm long, 3.5-4 mm across, densely many-flowered, rounded at apex, light brownish-rust-coloured.  Scales elliptical to oval-elliptical, brownish-rust-coloured, boat-shaped, keel green, apex obtuse, nerveless and brown-striolate on the both sides, ciliolate on the upper margin and upward.  Achenes broadly obovate nearly obdeltoid, 1-1.5 mm long, 1 mm wide or less, subcompressed-triangular, apiculate at apex, cuneate at base, faces flattish, stramineous-brown; hypogynous bristles 6 (sometimes 5), light brown, slightly exceeding achene, the longer 2 mm long or more, subcomressed, retrorsely scabrous with loose aculeae except at base; style about 3 mm long, the upper half trifid (stigmas), brownish-papulose.  Stamens 3, anther linear, 1.5 mm long, connective deltoid, reddish-brownish, very short" (Dassanayake, 1983; pp. 154-155).

Description from the Flora of China online.

Habitat/ecology:  In Sri Lanka, "marshy places both inland and near the coast; often forming a large community" (Dassanayake, 1983; pp. 154-155).

Propagation:  Seed

Native range:  India to southeast Asia, China, Japan, Malesia, northern Australia (GRIN).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Japan (offshore islands) Ogasawara (Bonin) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007) As Schoenoplectus grossus (L.f.) Palla
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. 117) In fresh-water swamps at low altitudes.

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)	Northern Territory	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia Australia (continental)	Queensland	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
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) Guangdong, Guangxi, Hainan, Yunnan
Indonesia Indonesia	Indonesia (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan Japan	Japan	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Malaysia Malaysia	Malaysia (country of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore Singapore	Singapore (Republic of)	native	Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 10) Common
Taiwan Taiwan Island	Taiwan Island	native	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
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)

Control:  If you know of control methods for Actinoscirpus grossus, please let us know.