Swainsona pedunculata is a species of flowering plant in the family Fabaceae and is endemic to inland areas of Western Australia. It is a small, ascending annual herb with imparipinnate leaves with 3 to 7 narrowly elliptic or lance-shaped leaflets, and racemes of 2 to 3 purple flowers.
Swainsona pedunculata is an annual herb up to high with strongly ribbed and hairy stems. Its leaves are imparipinnate, less than long on a long petiole, with 3 to 7, usually 5 narrowly elliptic or lance-shaped leaflets, the lower leaflets long and wide. There is a tapering linear stipule often long at the base of the petiole. The flowers are arranged in racemes with 2 to 3 flowers on a peduncle about long, each flower long on a pedicel long. The sepals are joined at the base, forming a tube about long, the sepal lobes about twice as long as the tube. The petals are purple, the standard petal about long and wide, the wings long, and the keel about long and long and deep. The fruit is about long and wide.[1]
Swainsona pedunculata 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 in the Kennedy Range in 1941.[2] The specific epithet (pedunculata) means "pedunculate".[3]
This species of pea grows in rocky or stony places in the Carnarvon, Gascoyne and Murchison bioregions of inland Western Australia.