Pacific Island Ecosystems at Risk (PIER)

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Cyperus pilosus
Vahl, Cyperaceae
No images for this taxon


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Reject, score: 7 (Go to the risk assessment).

Common name(s): [more details]

Chinese: mao zhou suo cao

English: fuzzy flat sedge

Japanese: oni-gayatsuri

Habit:  sedge

Description:  "Annual or short-lived perennial; rhizome stoloniferous, the stolons slender, elongated, soft, distantly clothed with pale brown scales; culms solitary or few together, erect, 25-85 cm tall, acutely triquetrous, 0.3-0.5 cm broad, smooth or scabrid on angles below corymb; leaves few to several to a culm, shorter than culm; blades broadly linear, flattish, 6-8 mm broad, rather soft; sheaths short, pale greenish to pale brownish, withering without disintegrating into fibers; corymbs ample, compound to decompound, with 3-10 rays of unequal length; rays patent, thickish, 2-14 cm long; secondary corymbs with 2-5 raylets 0.5-2 cm long; spikes subpyramidal, subdense, 2-3 cm long, 1-2 cm broad, the rhachis subdensely hirsute with yellow-brown short hairs; spikelets spreading, linear-lanceolate, 5-15 mm long, 1.5-2.5 mm broad, slightly swollen, 8-25-flowered, straw-colored and tinged with red-brown; rhachilla without wings; glumes subloosely disposed, broadly deltoid-ovate, acute at the often mucronulate apex, 1.8-2.2 mm long, thin-chartaceous to membranous, pale straw-colored and tinged or flecked with reddish brown, whitish-hyaline on margins, rather distinctly 5- or 7-nerved; achenes broadly elliptic to obovate, 3-sided, 1/2 to 2/3 as long as glume, dark brown at maturity; stigmas 3; style short; stamens 3"  (Smith, 1979; pp. 248-249).

Habitat/ecology:  "In Fiji it is a naturalized adventive, occurring near sea level along roadsides, in swamps and wet places along rivers, and in coconut plantations, pastures, cane fields and rice fields."  (Smith, 1979; pp. 248-249)  In Samoa, "uncommon on roadsides and in pastures" (Whistler, 1988; p. 42).

Propagation:  Seed

Native range:  Tropical West Africa through central Asia and India to Japan, eastward to Malesia and northern Australia (Smith, 1979; pp. 248-249).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Fiji
Fiji Islands
Taveuni Island introduced
invasive
Smith, Albert C. (1979) (pp. 248-249)
Voucher cited: DA 8890
Fiji
Fiji Islands
Viti Levu Island introduced
invasive
Smith, Albert C. (1979) (pp. 248-249)
Vouchers cited: DA 8634, DA 11449, DA 9439, DA 10809, DA 10015, DA 7622, DA 7403, DA 8379, DA 8615, DA 10616, DA 10576
French Polynesia
Marquesas Islands
Nuku Hiva (Nukahiva) Island   National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2004) (voucher ID: PTBG 42495)
Taxon name on voucher: Cyperus pilosus
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 1399)
Single collection in 1916. "It is uncertain if this species persists in Hawai'i." (Wagner et al., 1999). Voucher cited: Forbes 481.K (BISH)
Japan (offshore islands)
Ogasawara (Bonin) Islands
Bonin (Ogasawara) Islands   Kato, Hidetoshi (2007)
Palau
Palau (Belau ) (main island group)
Babeldaob Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 68)
Palau
Palau (Belau ) (main island group)
Koror (Oreor) Island native
Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1987) (p. 68)
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)
Samoa
Western Samoa Islands
Western Samoa Islands   Whistler, W. A. (1988) (p. 42)
Uncommon.
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)
Cambodia
Cambodia
Cambodia (Kingdom of)   Waterhouse, D. F. (1993) (p. 64)
China
China
China (People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Sparse forests, forest margins, grasslands on slopes, marshes, meadows, river margins, wet places, paddy fields, water margins, along trails, parks; near sea level to 2100 m. Anhui, Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangsu, Jiangxi, Shanxi, Sichuan, SE Xizang, Yunnan, Zhejiang.
China
China
Hong Kong native
Wu, Te-lin (2001) (pp. 310-311)
In marshes, paddy fields an other wet places.
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)
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, forest margins, grasslands on slopes, marshes, meadows, river margins, wet places, paddy fields, water margins, along trails, parks; near sea level to 2100 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)
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)
Louisiana, Mississippi, South Carolina
Naturalized
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized


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This page was created on 3 AUG 2002 and was last updated on 5 MAR 2010.