Introduction of sweet potato vine

Sweet potato vine is the stem and leaf of sweet potato in convolvulaceae. Sweet potato is a perennial vine, bare or slightly hairy, with milk. The root tuber is white, yellow, red or with purple spots. The leaves are ovoid to oblong, 6 ~ 14 cm long, the top is gradually pointed, the base is truncated to a heart shape, the edge is nearly entire, there are horns or nicks, and sometimes there are deeply divided fingers. Cymes, axillary, with several flowers on a stout peduncle; Calyx deeply divided, light green, about 65438 0 cm long, with a obtuse top but a small tip; Corolla funnel-shaped, 4 ~ 5 cm long, 5-lobed, purplish red or white; Stamens 5; Ovary 2-loculed, capsules usually few. Flowers bloom in winter.