Pacific Island Ecosystems at Risk (PIER)

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Scleria sumatrensis
Retz., Cyperaceae
No images for this taxon


Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: yin ni zhen zhu mao

English: nutrush, Sumatran scleria

Habit:  sedge

Description:  "Robust perennial with thick woody knotty rhizome. Culms erect or somewhat climbing on thickets, 1-4 m long, 6-8 mm thick below the middle, 3-sided with flat sides, glabrous, smooth or scabrid on angles. Leaves of normal kinds on the middle portion of culms, densely aggregated in 3 to 5 pseudowhorls; leaf-blades broadly linear, 20-40 cm long, 7-13 mm wide, thinly coriaceous, glabrous, often puberulent at base, 3-costate, recurved on scabrous margins, gradually tapering above to a long acuminate apex; sheaths densely overlapping, 5-7 cm long, 3-sided, slightly dilated upwards, glabrous or puberulent, winged or not-winged, brown-tinged toward the base; contra-ligule depressed-rounded, 2-3 mm long, straw-brown, densely ciliate. Inflorescence consisting of 2 to 4 dense decompound panicles, all contiguous, oblong to ellipsoidal in outline, 15-30 cm long, 7-10 cm wide, the lateral ones solitary at node but forming pseudowhorl; peduncles exserted, compressed-triangular with very acute scabrid angles; branches spreading, the angles very acute to wing-like; bracteoles setaceous, the secondary and tertiary ones shorter than spikelets. Pistillate spikelets and male spikelets solitary or in clusters of 2 or 3, both sexes intermingled but pistillate spikelets scarce; pistillate spikelets broadly ovoid, 3.5-4 mm long, yellowish-brown, sessile, the two largest glumes broadly ovate, 3.5-4 mm long, acute at apex, straw-brown or purplish-tinged; staminate spikelets sessile or short-peduncled, lanceolate, 3.5-4.25 mm long, yellow- or reddish-brown; stamens 3. Achenes slightly shorter than the subtending glumes, globose or depressed-globose, apiculate, 2-2.25 mm long and as wide, terete, distinctly scrobiculate, dark greyish or brownish at maturity, sparsely puberulent, umbonulate; hypogynium cup-like, half as long as to covering the the greater part of achene, coriaceous, yellowish and orange-red at maturity, 3-lobed, the lobes obtuse, toothed" (Dassanayake, 1983; p. 349).

Habitat/ecology:  "Dry grassy forests and scrubs as well as wet forests and sedge marshes of low country below 1300 ft." (Dassanayake, 1983; p. 349).

Propagation:  Seed

Native range:  "India and Ceylon northeastwards to Formosa, and eastwards to Malesia and tropical Australia" (Dassanayake, 1983; p. 349).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Philippines
Philippine Islands
Philippine Islands   Merrill, Elmer D. (1925) (p. 135)
In open places and in forests at low and medium altitudes.
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
China
China
China (People's 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)
Negara Brunei Darussalam
Brunei
Brunei (Negara Brunei Darussalam)   Waterhouse, D. F. (1993) (pp. 68, 78)
Singapore
Singapore
Singapore (Republic of)   Waterhouse, D. F. (1993) (pp. 68, 78)
Singapore
Singapore
Singapore (Republic of) native
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 78)
Vulnerable
Vietnam
Vietnam
Vietnam (Socialist Republic of)   Waterhouse, D. F. (1993) (pp. 68, 78)


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This page was created on 30 MAY 2005 and was last updated on 22 OCT 2006.