Scleria species

Please help me to identify this large grass found in rain forest of southern western ghats. The seeds are almost 0.3cm across; leaf: 20x1 cm.
Grass height: 1.5 metres
Date: 25 Aug 2012
Place: Valparai, TN
Alt.: 950 m asl
This is Scleria sp. of Cyperaceae. Not a grass.
The stems of most Cyperaceae are triangular in cross section, whereas all grasses have circular (terete) cross sections.
Scleria species, need a specimen to identify it.