Dillwynia floribunda is an erect shrub that typically grows to a height of and has hairy stems. The leaves are crowded along the branches, linear, oval in cross-sectiom, with a longitudinal groove on the uppersurface, long and mostly glabrous. The flowers are arranged in pairs in leaf axils near the ends of branches but often extending down the branches. The flowers are sessile or on a very short peduncle with bracts long and shorter bracteoles. The sepals are long and have a few long, finehairs and the standard petal long. The fruit is a pod long.