It is a perennial herbaceous plant. Its leaves are elliptic and obtuse. It grows as a vine or creeper, doing well in moist neutral soil. The most striking feature about this plant are its vivid deep blue flowers. They are solitary, with light yellow markings. They are about 4 cm long by 3 cm wide. There are some varieties that yield white flowers.

The fruits are 5 - 7 cm long, flat pods with 6 to 10 seeds in each pod. They are edible when tender.

It is grown as an ornamental plant and as a revegetation species (e.g., in coal mines in Australia), requiring little care when cultivated. Its roots fix nitrogen and therefore this plant is also used to improve soil quality.