Acacia flagelliformis is a species of shrub in the family Fabaceae that is endemic to an area of south-western Australia.

The rush-like shrub typically grows to a height of 0.3 to 0.75 metres (1 to 2 ft) and produces yellow flowers from May to September.

It is native to an area in the South West region of Western Australia where it is found in winter wet areas growing in sandy soils.

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