Swainsona eremaea is a low-growing, spreading, probably perennial herb, with initially erect stems. The leaves are imparipinnate, long with 5 to 11 linear, oblong to broadly wedge-shaped, or heart-shaped leaflets with their narrower end towards the base. The leaflets are mostly long and wide with
stipules up to long at the base of the
petioles. The flowers are bright red, brown or yellow, arranged in racemes of 5 to 20 on a
peduncle wide with broadly lance-shaped to elliptic
bracts long at the base. The
sepals are joined at the base, forming a tube long with lobes shorter than or equal to the tube. The
standard petal is long and wide, the
wings long and the
keel long and about deep. The fruit is a narrowly egg-shaped
pod long and wide. ==Taxonomy and naming==