Caustis gigas

Caustis gigas, commonly known as giant twig-rush, is a sedge that is native to Western Australia.

The rhizomatous perennial sedge has a robust habit and typically grows to a height of 2 m. The plant blooms between April and May producing brown flowers.

It is found in the Wheatbelt region between Chittering and Coorow where it grows in sandy soils.