Pacific Island Ecosystems at Risk (PIER)

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Cyperus digitatus
Roxb., Cyperaceae
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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: chang xiao sui suo cao

English: digitate cyperus, finger flat sedge

French: souchet digité

Spanish: cortadera

Habit:  sedge

Description:  "Tall perennial with short, erect, woody rhizomeCulms tufted or solitary, 60-150 (-200) cm tall, 3-7 mm tick, triquetrous above, trigonous below, smooth.  Leaves few to several, shorter than to equaling the culm; blades linear 1- or 3-costate, flat to plicate, 5-10 (-15) mm wide, herbaceous, or subcoriaceous, scabrous on margins, gradually long-acute at apex; sheaths up to 30 cm long, mostly stained with brownish purple or dusky brown.  Anthela compound or decompound, 15-40 cm long and as wide, rather dense; leafy bracts 3 to 8, patent, most of those overtopping the anthela, the longer ones up to 60 cm long and 10 mm wide, often colored at base with purplish-brown; primary rays 4 to 10, unequal, stiffly patent, smooth, the longer ones 10-30 cm long; secondary rays short, up to 3 cm long; bracteoles shorter than to nearly equaling the anthelule.  Spikes 4 to 10, digitate, cylindrical, 3-6 cm long, 1.5-3 cm wide, sublaxly bearing many spikelets; rhachis narrowly winged, glabrous.  Spikelets rectangularly spreading, linear, 6-20 mm long, 1-1.5 mm wide, weakly flattened, 8-30 (-40)-flowered, straw-coloured; rhachilla straight, the internodes 0.5 mm long, winged, the wings semitranslucent, caducous.  Glumes narrowly elliptic to elliptic, acute at apex, keeled on back, 1.8-2.2 mm long, c. 1 mm wide, membranous, obscurely 1- or 2-nerved along the costa, pale straw-coloured or weakly stained with reddish-brown, the keel greenish or brownish, ending at apiculate apex, not forming a mucro.  Achenes oblong-elliptic to oblong-obovate, trigonous, 0.9-1 mm long, 0.4-0.5 mm wide, yellow-brown; style up to 3 times as long as the achene; stigmas 3.  Stamens 3; anthers 0.5 mm long" (Dassanayake, 1983; p. 170).

Habitat/ecology:  In Venezuela, "damp shores, ditches, marshes, 0-500 m" (Berry et al., 1998; p. 529).

Propagation:  Seed

Native range:  "Pantropic with its range extending north into southern China and Formosa; abundant in South America and southern Asia, relatively scarce in tropical Africa and Australia" (Dassanayake, 1983; p. 170).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Commonwealth of the Northern Mariana Islands (US)
Northern Mariana Islands
Anatahan Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Ecuador (Galápagos Islands)
Floreana Group
Floreana Island introduced
invasive
Charles Darwin Foundation (2008)
Palau
Palau (Belau ) (main island group)
Babeldaob Island   Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island   Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Presence not verified.
Papua New Guinea
Papua New Guinea (eastern New Guinea Island)
Papua New Guinea (eastern New Guinea Island) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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)
New South Wales native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia
Australia (continental)
Queensland native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Panama (Republic of) 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) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Negara Brunei Darussalam
Brunei
Brunei (Negara Brunei Darussalam)   Waterhouse, D. F. (1993) (p. 64)
Singapore
Singapore
Singapore (Republic of) native
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 31)
Common
South America (Pacific rim)
South America (Pacific rim)
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim)
South America (Pacific rim)
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan
Taiwan Island
Taiwan Island native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Open areas in forests, ditches, wet places; near sea level to 1800 m.
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) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Texas
United States (continental except west coast)
United States (other states)
USA (Florida) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


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

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This page was created on 29 MAY 2005 and was last updated on 14 OCT 2006.