Carex phyllocaula is a sedge of the Cyperaceae family that is native to tropical parts of Asia in Thailand.
C. phyllocaula is a perennial sedge with a rhizome. It has a loosely tufted habit with smooth culms that have a triangular cross section and are typically in length and wide. The flat and linear cauline leaves that grow from the base and are green to dark brown in colour with a length of around and a width of .