Swainsona recta is an erect or ascending perennial plant that typically up to a height of with 1 or 2 slender, ribbed stems. Its leaves are imparipinnate, mostly long, with 5 to 13 very narrowly linear leaflets, the side leaflets mostly long and wide. There is a long, narrow
stipule, between long at the base of the petiole. The flowers are arranged in racemes long with about 6 to more than 25 flowers on a
peduncle long, each flower long on a densely hairy
pedicel long. The
sepals are joined at the base, forming a tube long, the sepal lobes usually half 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 deep. Flowering occurs between September and early December, and the fruit is long and wide with the remains of the
style about long. ==Taxonomy and naming==