The plant is semiwoody climber. Stem twinning, prickly muricate. Leaves simple, cordate with round lobes at base, acuminate at apex. Inflorescence axillary, 3 - 9 flowered dichasial cymes. Flowers large, blue-purple in colour, corolla infundibuliform, white on outside and throat light yellow inside. Fruit a capsule with  with persistent stylar beak. Seeds 2-4, black.