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Medicinal Parts: The medicinal parts are the whole flowering plant and the root.
Flower and Fruit: The solitary white flowers are about 5 cm long; the pedicle is quadrangular. Under the calyx there are 2 cordate, pointed, red-bordered bracts, which extend to cover the calyx. There are 5 sepals. The corolla is fused and conical. There are 5 stamens and 1 superior ovary. The fruit is a capsule.
Leaves, Stem, and Root: The plant is about 10 to 30 cm high and has a creeping rhizome. The stem is angular, glabrous, and twining. The leaves are alternate, petiolate, cordate or arrow-shaped. The base of the leaves are …