Tetratheca hirsuta, commonly known as black-eyed Susan, is a small shrub in the family Elaeocarpaceae.

Endemic to the south-west of Western Australia, it is not related to other plants known as black-eyed Susan around the world.

It has a woody rootstock from which arise multiple rough stems which are hairy at their upper ends.

[1][2] The species was first formally described by English botanist John Lindley in 1839 in A sketch of the vegetation of the Swan River colony [3] The specific name hirsuta is Latin "hairy".

[2] The genus name is derived from the Ancient Greek tetra "four", and theke "sac, box" and relates to the four-celled anthers.