Cyperus prolifer (Cultivated)

 Images by Aarti Khale - Id by Vijayasankar Raman

Dwarf papyrus,  Miniature cyperus, Miniature flatsedge, Miniature papyrus; 
Aquatic plant for ID : 261210 : AK-1: Taken at the Royal Botanic Gardens, Peradeniya, Kandy, Sri Lanka on the 17th of November, 2010.
- I think it is an ornamental Cyperus, most probably Cyperus isocladus.
- Photos available on net perfectly match with C. isocladus.