1、 Leaves

Duheng's leaves are heart-shaped or kidney heart-shaped, with a length and width of 3-8 cm. The front end is blunt or round, and the bottom is heart-shaped. The lobes on both sides are about 1-3 cm long and about 1.5-3.5 cm wide. The leaf surface is dark green and the back is light green. There are white spots on both sides of the veins in the middle of the leaves, short hairs on the veins and nearby edges, and the length of the petiole is about 3-15 cm

2、 Flowers

Du Heng's flowers are dark purple, the length of pedicel is between 1-2 cm, the perianth is tubular, 1-1.5 cm long, 8-10 mm in diameter, the throat is not constricted, the diameter of laryngeal pore is 4-6 mm, the membrane ring is very narrow, less than 1 mm in width, and the inner wall has obvious lattice mesh. Perianth equal, 4-5 mm long, without folds at perianth, nearly 4-5 mm long, and ovate