Showy Rattlepod is a perennial shrub, 1-1.5 m tall. Oblong leaves are 4-9 cm long, with a wedge-shaped base. Numerous large yellow flowers occur in erect racemes, 15-30 cm long, at the end of branches. Flowers are 2.5 cm across, bright yellow, with purple tinge. The "standard" petal is circular.