Swainsona rostellata is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Western Australia.

It is a prostrate perennial herb with imparipinnate leaves with 7 to 13 wedge-shaped leaflets, and racemes of usually up to 3 purple flowers.

[2] Swainsona rostellata was first formally described in 1948 by Alma Theodora Lee in Contributions from the New South Wales National Herbarium, from specimens collected by Charles Gardner on Mount Magnet in 1931.

[4] The specific epithet (rostellata) means "possessing a small beak or snout", referring to the tip of the keel.

[5] This species of pea grows red soil or clay loam on the edges of salt lakes or near swamps, in the Coolgardie, Murchison and Yalgoo bioregions of inland Western Australia.