Pacific Island Ecosystems at Risk (PIER)

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Cyperus sphacelatus
Rottb., Cyperaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: roadside flatsedge

Spanish: mandinga, piripiri

Habit:  sedge

Description:  "Herbs, annual or perennial, cespitose. Culms trigonous, 15-60 cm x 1-3 mm, glabrous. Leaves 2-6, flat to V-shaped, 6-30(-40) cm x 2-4 mm. Inflorescences: spikes broadly ellipsoid, 5-45 x 10-30(-45) mm; rays (2-)5-9, (0.3-)3-10 cm; rachis 4-17 mm; bracts 5-6, horizontal to ascending, V-shaped, 1.5-30 cm x 0.5-4 mm; rachilla persistent, wings hyaline, 0.4-0.5 mm wide. Spikelets 5-30, pale greenish white or stramineous, compressed, linear-lanceoloid, 7-35 x (1.2-)1.4-2 mm; floral scales deciduous, 6-34, spreading or appressed, laterally greenish white, often reddish or brown speckled, medially green, laterally 3-5-ribbed, medially 3-ribbed, elliptic, (2.2-)3-4(-4.4) x (1.2-)1.8-2.2 mm, apex acute. Flowers: anthers 0.6 mm; styles 0.6-1.2 mm; stigmas 1-1.4(-1.7) mm. Achenes reddish brown to dark brown, stipitate, narrowly ellipsoid, 1.4-2 x 0.6-0.9 mm, apex apiculate, surfaces puncticulate"  (Flora of North America online).

Habitat/ecology:  In North America, disturbed, wet soils at low elevations  (Flora of North America online).

Propagation:  Seed

Native range:  Central and South America, central and southern Africa, Madagascar (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
French Polynesia
Marquesas Islands
Nuku Hiva (Nukahiva) Island introduced
invasive
Lorence, David H./Wagner, Warren L. (2013)
Voucher cited: W.L. Wagner, D.H. Lorence, J. Florence, S.P. Perlman 6109 (BISH, US)
French Polynesia
Marquesas Islands
Nuku Hiva (Nukahiva) Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Adventice
French Polynesia
Society Islands
Moorea Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Adventice
French Polynesia
Society Islands
Raiatea (Havai) Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Voucher cited: J. Florence & P. Birnbaum 9949 (PAP)
Adventice
French Polynesia
Society Islands
Tahiti Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Voucher cited: P. Morat 6392 (PAP)
Adventice
French Polynesia
Austral (Tubuai) Islands
Rurutu Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Voucher cited: J. Florence 9183 (PAP)
Adventice. Bord de piste ensoleillé. Paraît d'introduction récente.
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Oppenheimer, Hank (2008) (p. 27)
Vouchers cited: Oppenheimer et al. H50643 (BISH, PTBG), Oppenheimer H110739 (BISH, PTBG)
Palau
Palau (Belau ) (main island group)
Babeldaob 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) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
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)
Queensland introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Central America
Central America (Pacific rim)
Nicaragua (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)
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 193)
Malaysia
Malaysia
Malaysia (country of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
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)
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)
USA (Florida) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized


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This page was created on 19 FEB 2010 and was last updated on 10 MAR 2010.