Cyperus portae-tartari is a sedge of the family Cyperaceae that is native to Australia, and found in the Northern Territory and Western Australia.

The robust perennial sedge typically grows to a height of 0.2 to 0.9 metres (0.7 to 3.0 ft) and has a tufted habit. It blooms between February and March producing brown flowers.

The species was first described in 1980 by Karen Wilson.

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