Cyperus arenarius   Retz.  (Protozoan)
Organism information awaits expert curation
Class: Equisetopsida

Size: 6-30 cm.

A perennial plant. Rhizome long creeping, deep in sand, c. 1 mm diam. Roots thin, not tomentose. Stem c. 1 mm diam., almost terete, smooth. Leaves c. equalling the stem; sheaths 20-40 mm, strongly nerved, rigid, with brown veins, disintegrating into fibres with age, mouth margin straight; ligule 0; blades c. 1 mm wide, stiff, curved, greyish green, semi-circular in transverse section, margins slightly scabrous, apex flat, blunt or acute, slightly scabrous. Inflorescence c. 20 mm diam., capitate, with 5 to more than 20 spikes, seldom with some elongated branches; bracts 1-2 foliose, up to 50 (100) mm, rigid, sheath-less, one often as continuation of stem; spikes 8-20 mm, ovoid, compressed, glumelike bracts c. 5 mm, glume-like prophyll 4 mm, widely ovate, with scarious margins, blunt; glumes 14-24, closely imbricating, caducous, 4-5 mm, cymbiform, with rounded back, pale brown, mucronate, sides with c. 6 obscure nerves, which often reddish brown, margins scarious; rachis zigzagging, c. 1 mm wide, internodes c. 0.5 mm, margins sharp, hardly winged. Stamens 3. Nut 1.5-1.7 x c. 1.3 mm, obovoid, plano-convex, compressed, brown or dark brown, almost smooth, glossy.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Reef Associated, Sandy


• East Coast INDIA
• Maharashtra INDIA
• Karnataka INDIA
• Tamil Nadu, Krusadai Island INDIA
• Tamil Nadu INDIA
• Andhra Pradesh INDIA
• Orissa INDIA
• West Bengal INDIA
• Orissa, Paradwip, Baroparia INDIA

Literature Source(s)
  • Krishnana, AA; Yousufa, KS; Kumarana, PL; Harisha, N; Anoopa, B; Afsala, VV; Rajagopalana, M; Vivekanandana, E; Krishnakumar, PK and Jayasankara, P (2007) Stomach contents of cetaceans incidentally caught along Mangalore and Chennai coasts of India Estuarine, Coastal and Shelf Science Elsevier B.V. 76(4) 909-913 Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Rodrigues, RS; Mascarenhas, A; Jagtap, TG (2011) An evaluation of flora from coastal sand dunes of India: Rationale for conservation and management Ocean & Coastal Management Elsevier B.V. 54(2) 181-188 Available at -
  • Stoddart, DR and Fosberg, FR (1972) South Indian sand cays Atoll Research Bulletin 161 1-25 Available at -
  • Available at -
  • Banerjee, LK and Roa, TA (2001) Flora of the Mahanadi Delta, Orissa Botanical Survey of India 1-307 Available at - NIO,Goa

Page last updated on:2011-11-23

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