Cyperus dubius Rottb., Descr. Icon. Rar. Pl. 20 1773. (Syn: Cyperus capitatus Poir. [Illegitimate]; Cyperus capitellatus Schult.; Cyperus coloratus Vahl; Cyperus daphaenus Ridl.; Cyperus dregeanus var. incrassatus C.B.Clarke; Cyperus dubius Boeckeler [Illegitimate] …………………; Cyperus kyllingioides Vahl; Cyperus kyllingioides var. incrassatus (C.B.Clarke) Kük.; Cyperus maritimus (Miq.) Suringar [Illegitimate]; Cyperus merrillii (C.B.Clarke) Kük.; Cyperus mollis Poir.; Cyperus thouarsianus C.Presl; Isolepis boeckeleri Oliv.; Kyllinga mariae Steud.; Kyllinga multinervia Steud.; Kyllinga triceps Rottb. [Illegitimate]; Mariscus coloratus (Vahl) Nees; Mariscus decaryi Cherm.; Mariscus decaryi var. pauciflorus Cherm.; Mariscus detersus C.B.Clarke ex Cherm.; Mariscus dregeanus Kunth; Mariscus dregeanus var. buchananii C.B.Clarke; Mariscus dubius (Rottb.) Kük. ex G.E.C.Fischer; Mariscus irroratus Nees; Mariscus kraussii Hochst.; Mariscus kraussii var. capitatus Cherm.; Mariscus kyllingiiformis Boeckeler; Mariscus maritimus Miq.; Mariscus merrillii C.B.Clarke; Mariscus niveus (L.) Merr. [Illegitimate]; Schoenus bobartiae Retz.; Schoenus niveus L.; Scirpus glomeratus L.);
 

 Images by Santhan P

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Erect, tufted perennials with short rhizome; culms 15-38 cm tall, triquetrous, base bulbous, covered with brown membranous sheaths. Leaves many, basal, 16-30 x 0.2 – 0.4 cm, linear, gradually acuminate at apex, scabrid on margins towards the apex; sheaths 2-6 cm long, basal ones brown. Inflorescence simple, congested in a dense, hemispherical, ovoid, white, head, 1-2 cm long and wide; leafy bracts 3-5, the longest upto 20 cm long. Spikelets 5-8 x 1.5-2.5 mm, ovate-acute, turgid-flattened. Glumes 4-9, distichous, 2.5-3.5 x 2-3 mm, broadly ovate, apex subacute, whitish. Stamens 3; anthers c. 1.5 mm long, oblong. Stigma 3. Nuts 1.5-2 x 0.5 mm, oblong-ellipsoid, trigonous, light brownish.

Flowering and fruiting: August-December
Deciduous forests, wastelands and roadsides
Tropical Africa, India, Indo-China to Malesia
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi
 

This species is distributed in old world tropics.
In India it is reported from Karnataka (Mysore, Chitradurga, Jogimatti hill station), Kerala (Idukkai, Kottayam, Quilon, Thiruvananthapuram, Palaghat), Madhya Pradesh (Bilaspur, Hoshangabad), Tamil Nadu (Madurai, Nilgiris, Ramanathapuram, Salem, Thanjavur, Tiruthuraipoondi, Trichy, Tirunelveli, Kanyakumari, Coimbatore) and Andhra Pradesh (throughout; B. Sadasivaiah pers. comm.) (Cook 1996, Verma 2001, BSI Coimabtore).
It also occurs in south-west Saudi Arabia, in Asir and areas such as Jabal Fayfa and Tannuma, north of Abha (Chaudhary 2001).  

It is a perennial herb growing in seasonally flooded areas and in pockets of soil in rocks. It is not confined to wetlands and is sometimes found as a weed in fields and near the sea on sandy beaches (Cook 1996); it is also seen in open shady places (Bhargavan 1989). 
Citation: Kumar, B. 2013. Cyperus dubius. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 07 November 2014.

 
 
Cyperus dubius Rottb. SN Oct47 : 1 post by 1 author. Attachments (2)
Cyperus dubius Rottb., erect short sedge on the hill top at Royakota, Krishnagiri dt, Tamilnadu


 
  
 
 

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