''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 . 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.

References

{{Taxonbar, from=Q22987767 Plants described in 2015 Flora of Western Australia gigas Taxa named by Russell Lindsay Barrett