Climbers, the stems herbaceous at the tips, woody at the base, grayish pubescent. Leaves ovate, 4-9 cm long, cordate basally, obtuse, acute, acuminate or cuspidate apically, pubescent on both surfaces. Flowers lateral or terminal, paniculate or racemose or thyrsiform cl usters. Sepals linear, 1-1.5 mm long, densely tomentellous. Corolla white, funnel-shaped, 5-6 mm long. Fruits indehiscent, ovoid-globose, 5-6 mm long, the outer 3 sepals enlarged and wing-l ike. Seeds ovoid, brown.