Eragrostis australasica, commonly known as swamp canegrass, is a tussock grass, in the subfamily Chloridoideae of the family Poaceae, that is endemic to Australia.

It is a tufted perennial with strongly branched, cane-like culms, that grows up to 2.4 m in height.

It is typically found on periodically flooded land in arid and semi-arid regions.

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