Senna cuthbertsonii is an upright or spreading, sometimes prostrate shrub that typically grows to a height of and is densely woolly-hairy, especially on the lower surface of the leaves. The leaves are pinnate, long on a
petiole long with two to four pairs of elliptic to egg-shaped leaflets with the narrower end towards the base, long, wide and spaced about apart. There are three to five
glands between the lower pairs of leaflets. The flowers are yellow and arranged in leaf axils in groups of two to four on a
peduncle about long, each flower on a
pedicel about long. The petals are about long and there are ten fertile stamens, the
anthers long. Flowering is thought to occur in early summer, and the fruit is a flat, straight
pod long, about wide. ==Taxonomy==