Botany
Kangkong is a smooth, widely spreading vine, with the stems trailing on mud or floating on water. Leaves are oblong-ovate, 7 to 14 centimeters long, with a pointed tip and heart-shaped or arrow-shaped base, long petioled, the margins entire or angular, and sublobed. Peduncles are erect, 2.5 to 5 centimeters long, with 1 or 2 flowers, borne in the axils of the leaves. Sepals are green, oblong, about 8 millimeters long. Corolla is narrowly bell-shaped, about 5 centimeters long, and purplish; limb nearly white or pale pink purple, about 5 centimeters in diameter, the tube deeper purple inside. Capsules are smooth and ovoid, about 1 centimeter long.