Pacific Island Ecosystems at Risk (PIER)

  [   PIER species lists  ]   [   PIER home  ]

Cyperus gracilis
R.Br., Cyperaceae
Click on an image for links to BIGGER PICTURES


Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: McCoy grass, slender sedge, whisker grass

Hawaiian: mau‘u hunehune

Habit:  sedge

Description:  "Perennials, rhizomes short, covered with brown fibers; culms slender, 10-35 cm tall, 0.2-0.5 mm in diameter, somewhat thickened at base.  Leaves 2-3 per culm, blades linear-filiform, 1/3-1/2 as long as the culm, 0.5-1 mm wide, channeled, apex long-acuminate; sheaths brown.  Inflorescence a digitate head of 2-6 spikelets; involucral bracts 2-3, filiform, 3-10 cm long, reflexed; spikelets 8-24-flowred, pale green, linear-oblong, flattened, 5-12 mm long, ca. 2 mm wide, subacute, rachilla not winged; glumes closely spaced, broadly ovate, 2-2.3 mm long, 1.8-2 mm wide, margins hyaline, pale green and sometimes tinged yellowish brown, finely 3-7-nerved, apex acute, the keel green, prominent, ending in a short recurved mucro; style filiform; stigmas 3.  Achenes brownish black at maturity, obdeltoid-obovoid, ca. 1 mm long, trigonous, apex subtruncate, apiculate, base stipitate"  (Wagner et al., 1999; p. 1396).

Habitat/ecology:  In Hawai‘i, "cultivated as a ground cover in shaded sites and sparingly naturalized, 0-170 m" (Wagner et al., 1999; p. 1396).  "Uncommon in disturbed places" (Whistler, 1988; p. 41).

Propagation:  Seed

Native range:  Australia and New Caledonia in wet, partially shaded areas (Wagner et al., 1999; p. 1396).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Australia (Pacific offshore islands)
Norfolk Islands
Norfolk Island introduced
invasive
Orchard, Anthony E., ed. (1994) (p. 11)
"Rare. Probably a recent introduction". Vouchers cited: W.R. Sykes NI 468(CHR), K.L. Wilson 6261 (K, NSW)
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Starr, Forest/Starr, Kim/Loope, Lloyd L. (2003) (p. 27)
Voucher cited: Starr & Martz 010801-12 (BISH)
State of Hawaii
Hawaiian Islands
Kaho‘olawe Island introduced
invasive
Starr, Forest/Starr, Kim (2011) (p. 25)
Voucher cited: Starr, Starr & Higashino 080209-01 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1396-1397)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Oppenheimer, Hank L./Bartlett, Randal T. (2002) (p. 7)
Voucher cited: Oppenheimer H109912 (BISH)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1396-1397)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
cultivated
Hughes, Guy D'Oyly (1995) (p. 3)
Voucher cited: Hughes 13 (US)
Common in lawns, along roadsides, and in disturbed areas.
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
cultivated
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 1396-1397)
New Caledonia
New Caledonia
New Caledonia Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
New Caledonia
New Caledonia Archipelago
Île Grande Terre native
MacKee, H. S. (1994) (p. 144)
Vouchers cited: MacKee 26176, MacKee 43724
Niue
Niue
Niue Island introduced
Whistler, W. A. (1988) (p. 41)
Tonga
Tongatapu Group
Tongatapu Island   Whistler, W. A. (1988) (p. 41)
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)
Victoria
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)
United States (west coast)
United States (west coast states)
USA (California) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized


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

  [   PIER species lists  ]   [   PIER home  ]

This page was created on 3 AUG 2002 and was last updated on 14 OCT 2006.