Hemp potato beans grow in the axils of the leaves of hemp potato vines. Yam bean is different from yam. Usually, the yam we eat is a stem, while yam bean is a kidney-shaped or oval bead between the axils of yam leaves. The name "Lai Ji" is also called yam seed, commonly known as "yam bean, yam egg", which has the function of food tonic.

Yam bean and Yam are born from the same root, but Yam is in the soil and yam bean grows on it. Since it is a kind of plants, their effects are similar, and yam bean porridge also has the function of nourishing the stomach. Anyone who has eaten yam will know the taste of yam bean. They are the same.