Cyperus aquatilis is a sedge of the family Cyperaceae that is native to Australia and New Guinea.

The annual sedge typically grows to a height of 3.5 to 5 centimetres (1.4 to 2.0 in). The plant blooms between April and August producing green-brown flowers.

In Western Australia it is found around creeks and swamps in the Kimberley region where it grows in sandy-loamy soils often around laterite.

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