Mucuna sloanei var. persericea, a member of the Fabaceae (pea) family, is a woody vine that climbs to at least 6 m) (19.6 ft ) tall. Its leaves are alternate, three-foliolate (with three leaflets), and 17 to 25 cm (6.7 to 9.8 in) long. The inflorescence is a pseudoraceme (a pedicel-like stalk) that is pendent (suspended or hanging down from a support). The peduncle (the stalk of an inflorescence or of a solitary flower) is 4 to 8 cm (1.6 to 3.1 in) long. The calyx (collective term for all of the sepals of a flower) is campanulate (bell-shaped), and 2.5 to 3 cm (0.9 to 1.1 in) long. Flower petals are yellow and 3.5 to 4 cm (1.4 to 1.6 in) long. The wing (lateral) petals are 4.5 to 5 cm (1.8 to 1.9 in) long. The keel (partly connate lower) petals are 4 to 5 cm (1.8 to 1.9 in) long. The fruit are tough and flexible, 10 to 12 cm (3.9 to 4.7 in) wide and 4 cm (1.5 in) long, and the surface has short dense spreading pale fine hairs and irritant red bristles. The fruit margin has a pair of distinct wings. The seeds are never more than 2.5 cm (0.9 in) long. The seeds are brownish black, rugose (wrinkled), and large, 2 to 3 cm (0.7 to 1.1 in) in diameter.