Cyperus sulcinux is a sedge of the family Cyperaceae that is native to Australia.

The annual herbaceous or grass-like sedge typically grows to a height of 0.05 to 0.4 metres (0.16 to 1.31 ft) and has a tufted habit. In Western Australia it is found around seepages in a small area to the north of the Kimberley region where it grows in sandy soils over sandstone.

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