Cyperus hillebrandii

Cyperus hillebrandii, commonly known as Hillebrand's flatsedge, is a species of sedge that is endemic to Hawaii.

The species was first formally described by the botanist Johann Otto Boeckeler in 1880.

It has two subspecies:
 * Cyperus hillebrandii subsp. decipiens
 * Cyperus hillebrandii subsp. hillebrandii