Cyperus clarkei

 Images by (Anurag Sharma – Id by V.P.Prasad), (inserted by Bhagyashri Ranade)

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Cyperus clarkei is endemic to India, Sri Lanka and Viet Nam and Myanmar. In India it is found in Andhra Pradesh, Karnataka, Maharashtra, Rajasthan and Tamil Nadu.

Cyperus clarkei is a perennial plant growing in seasonally flooded places and on wet sand in river beds. It is seen in the plains up to an altitude of 1,500 m.  
Citation: Rehel, S. 2013. Cyperus clarkei. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 23 August 2014.

Rhizome stoloniferous, 5-10 cm long, clothed with brown scales; culms solitary, to 25 cm tall. Leaves to 20 cm long, acuminate. Umbel 5 x 3 cm; bracts larger than umbel; spikes 15 x 7 mm, cylindrical, sessile. Spikelets 3 x 8 mm. Glumes 2; one sterile and one fertile.
Flowering and fruiting: October-December
Marshy areas in grasslands
South India and Sri Lanka
(Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi
 
 
ANAUG16 Herb for ID : 5 posts by 2 authors. Attachments (4).  
Bangalore August 2014

it may be cyperus cyproides

Looks like Cyperus clarkei T. Cooke often found in Southern India, Sri Lanka and Vietnam.