Invasive Alien Species

Species Name: Cyperus spacelatus

Family Name:
Tropical Africa or America.
Annual with fibrous roots, without stolons, 10-30 cm tall. Stem slender to rather stout, tufted, sharply 3-angled, smooth.  Leaves few, shorter than the stem,linear, flat or slightly channeled. Inflorescence terminal, simple or compound, lax; involucral bracts foliaceous, erect, patent, unequal, slender lower one up to 20 cm; primary rays 3-5, unequal,  up to 10 cm, secondary rays if present 0.5-1 cm; spikes broadly ovoid, usually 2 x 3 cm, sometimes up to 5 x 8 cm, with 3-10 spikelets; spikelet with 10-20 flowered, 1-2 cm x 0.8-1 mm; flowers bisexual, naked; stamens 3. Nut sharply tri-angels ellipsoid or slightly obovoid, concave at the ventral side, brown, 1.3-1.5 x 0.8-1 mm.
Invaded Habitat:
Grasslands, upland rice fields.
First collected in North Sumatra in 1922, spread throughout Indonesia except, Sulawesi and Nusa Tenggara as far as known.
Grows in low altitudes, spread fast.
  1. Backer , C. A. & R. C. Bakhuizen Van Den Brink.  1965.  Flora of Java. N.V. P. Noordhoff. Groningen, Netherlands
  2. Soerjani, M.,  A. J. G. H. Kostermans & Gembong Tjitrosoepomo (Eds.).  1987.  Weeds of Rice in Indonesia. Balai Pustaka. Jakarta