Pacific Island Ecosystems at Risk (PIER)

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Cyperus haspan
L., Cyperaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Cyperus halpan L. [incorrect spelling]

Common name(s): [more details]

Chinese: qi pan suo cao

English: dwarf papyrus sedge, haspan flat sedge, sheathed cyperus

Japanese: ko-azegayatsuri

Spanish: papiro enano

Habit:  sedge

Description:  "Perennial, with red-purple fibrous roots; rhizomes slender, horizontal, short or elongated; culms solitary and arranged in a row along an elongated rhizome or tufted with a short rhizome, erect, mostly 10-50 cm tall, slender, trigonous, rather soft; leaves as a rule reduced to bladeless sheaths at base of culms; sheaths 2-10 cm long, pale green and usually tinged with brown, purple-brown, or red-purple; blades occasionally developing especially in relatively dry habitats, but short; corymbs compound or simple, lax, 8-15 cm long and broad; rays several, unequal, the longer ones 5-10 cm long, slender, the raylets, if developing, few, up to 2 cm long; leafy bracts 1 or 2, the longer one equaling to slightly shorter than corymb; spikelets digitately disposed at apices of rays or raylets, 4-6 together, linear-oblong, obtuse-tipped, flattened, 5-15 mm long, 1-1.5 mm broad, subdensely 10-28-flowered, the wingless rhachilla completely hidden by densely disposed glumes; glumes elliptic to lance-elliptic, ovate, about 1.5 mm long, membranous, pale brownish and often tinged or variegated with rusty-brown or purple-brown, slenderly 3-nerved, the greenish keel ending in a short mucro; achenes obovate, 3-sided, about 0.5 mm long, cream-yellow, tuberculate; style 1.5 times as long as achene; stigmas 3; stamens 3-1"  (Smith, 1979; pp. 252-253).

Habitat/ecology:  In Fiji, "occurs from near sea level to 160 m as a naturalized adventive, in wet open places, swamps, pastures, creek banks, and rice fields" (Smith, 1979; pp. 252-253).  In Hawai‘i, "naturalized in wet, disturbed sites, especially in bogs, wet forest, and open, muddy areas, 3-1,700 m" (Wagner et al., 1999; pp. 1397-1398, 1899).

Propagation:  Seed

Native range:  Subtropical and tropical regions worldwide.

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
Chuuk Islands   Swarbrick, John T. (1997) (p. 90)
Federated States of Micronesia
Chuuk Islands
Ulalu (Romonum) Island   Wagner, W. L./ Herbst, D. R./Weitzman, A./Lorence, D.H. (2013)
Federated States of Micronesia
Pohnpei Islands
Pohnpei Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Federated States of Micronesia
Pohnpei Islands
Pohnpei Island introduced
invasive
Herrera, Katherine/Lorence, David H./Flynn, Timothy/Balick, Michael J. (2010) (p. 41)
Naturalized
Federated States of Micronesia
Yap Islands
Ifalik (Ifaluk) Atoll native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Federated States of Micronesia
Yap Islands
Woleai Atoll native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Federated States of Micronesia
Yap Islands
Yap (Waqab) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Fiji
Fiji Islands
Vanua Levu Island introduced
invasive
Smith, Albert C. (1979) (pp. 252-253)
Vouchers cited: DA 5021, DA 10461, Degener & Ordonez 14105
Fiji
Fiji Islands
Viti Levu Island introduced
invasive
Smith, Albert C. (1979) (pp. 252-253)
Vouchers cited: Smith 9627, DA 9180 (McKee 2744), DA 7623, DA 7407, Greenwood 1134, DA 10612, Meebold 17104
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1396-1398)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1396-1398)
Voucher cited: Stone 1665 (BISH)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Oppenheimer, Hank (2008) (p. 27)
Voucher cited: Oppenheimer & J. Perlman H50614 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1396-1398)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Hughes, Guy D'Oyly (1995) (p. 4)
Voucher cited: Hughes 15 (BISH)
Occasional in very wet forest areas to at least 800 m elevation.
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wood, K. R. (2006) (p. 17)
Voucher cited: K.R. Wood & J. Lau 10637 (PTBG)
New Caledonia
New Caledonia
New Caledonia Islands   Swarbrick, John T. (1997) (p. 90)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
invasive
Tassin, Jacques (2005)
New Caledonia
New Caledonia Archipelago
Île Grande Terre introduced
MacKee, H. S. (1994) (p. 47)
Vouchers cited: MacKee 2337, Raynal 16440, MacKee 27981, MacKee 38160, Hoff 3521 (NOU)
Palau
Palau (Belau ) (main island group)
Babeldaob Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Palau
Palau (Belau ) (main island group)
Babeldaob Island   Beleu National Museum (Republic of Palau. Koror.) (1978) (voucher ID: BNM 1058)
Taxon name on voucher: Cyperus halpan L.
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 66)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Space, James C./Lorence, David H./LaRosa, Anne Marie (2009) (p. Field notes)
Palau
Palau (Belau ) (main island group)
Peleliu (Beliliou) Island   Wagner, W. L./ Herbst, D. R./Weitzman, A./Lorence, D.H. (2013)
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)
Philippines
Philippine Islands
Philippine Islands   Merrill, Elmer D. (1925) (pp. 105-106)
In open wet places; a common and characteristic rice paddy weed.
Solomon Islands
Solomon Islands
Solomon 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)
Australia (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Western Australia
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)
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)
Sparse forests, grasslands on mountain slopes, sand by river margins, swamps, ditch margins in valleys, wastelands, wet places, along trails, dry fields, paddy fields; near sea level to 1600 m. Anhui, Fujian, Guangdong, Guangxi, Hainan, S Henan, Hubei, Hunan, S Jiangsu, Jiangxi, SE Xizang, S Yunnan, Zhejiang.
China
China
Hong Kong native
Wu, Te-lin (2001) (pp. 309-310)
As Cyperus halpan L. In wet places and paddy fields.
Colombia
Colombia
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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)
South Korea
South Korea
South Korea (Republic of)   Holm, Leroy/Doll, Jerry/Holm, Eric/Pancho, Jaun/Herberger, James (1997) (p. 270)
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)
Chiapas, Guerrero, Michoacan, Nayarit, Tabasco, Veracruz
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore
Singapore
Singapore (Republic of)   Waterhouse, D. F. (1993) (p. 64)
Singapore
Singapore
Singapore (Republic of) uncertain if introduced
invasive
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 31)
Weed of uncertain origin
Taiwan
Taiwan Island
Taiwan Island native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Sparse forests, grasslands on mountain slopes, sand by river margins, swamps, ditch margins in valleys, wastelands, wet places, along trails, dry fields, paddy fields; near sea level to 1600 m.
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)
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Comoros
Comoro Islands
Comoro Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
India (Indian Ocean offshore islands)
Andaman Islands
Andaman Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
India (Indian Ocean offshore islands)
Nicobar Islands
Nicobar Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Seychelles
Seychelles Islands
Seychelles Islands 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) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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 1 JAN 1999 and was last updated on 14 OCT 2006.