Gastrolobium spinosum, also known as prickly poison, is a shrub in the family Fabaceae.

It is endemic to Southwest Australia The species ranges from 0.3 to 3.5 metres in height.

It has leaves with spiky, dentate margins and a long, tapering, pointed apex.

The species was first formally described by English botanist George Bentham, this description being published by John Lindley in A Sketch of the Vegetation of the Swan River Colony in 1839.

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