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Rhizoma Dioscoreae

often referred to in English as "Chinese yam" or "Asian yam"

It is a plant species that belongs to the genus Dioscorea. 

It is commonly known for its starchy tuber, 

which is used as a food source and has been highly valued for its medicinal properties in traditional Chinese medicine for thousands of years.

The edible part of the yam is its long, thick, and fleshy underground stem, which can grow up to several feet in length. 

The skin of the yam is brown and rough, while the inside flesh is cream-colored and has a mild, slightly sweet flavor with a texture that is similar to that of a potato but more fibrous.

Yams are rich in nutrients and contain an array of vitamins and minerals, such as vitamin C, potassium, and fiber. They also have a good amount of complex carbohydrates and are low in fat. In terms of health benefits, yams are believed to support digestive health, improve immune function, and enhance energy levels due to their high content of compounds like polysaccharides and saponins.

In cooking, yams can be prepared in various ways, including steaming, boiling, roasting, or frying. 

They are a staple ingredient in many Asian dishes and can be used in both savory and sweet recipes. 

In some cultures, yams are also used to make flour or as a natural sweetener in baking.

Overall, the yam's combination of nutritional value, culinary versatility, and historical medicinal use makes it a highly regarded tuber around the world.