Wild yam generally refers to Dioscorea nipponica, which has many aliases, also known as keels, chicken bones, dioscorea, longbi, etc. It is a perennial herb, with a length of 5 meters. The rhizome grows crosswise. There are many branches on it. The outer skin is yellowish brown, which is easy to become flakes and fall down. The cross section is yellow.
The length of the leaves is 10-20cm, the width is about 9-13cm, the shape is palmate heart-shaped, the edge has different sizes of cracks, generally 5-7 cracks, above is yellow green with luster, no hair distributed on it, or sparse white hairs distributed on the veins, more distributed, more dense.
The flowers are unisexual, and the color of the flowers is yellow green after they open. The flowers are relatively small. The position of the base is generally composed of 2-4 small flowers in the shape of an umbrella. The flowering period is from June to August.
The capsule is oval or oval in shape, with three wings on the edge. The wings on each edge are different in size, generally about 2cm in length and 1.5cm in width. When it is mature, it is withered yellow. The fruit period is from July to September.
