Deer's foot herb is the collective name of deer hoof grass or round-leaved deer hoof grass and other plants in the deer hoof grass family. It is also known as Deer Horsetail Grass, Deer Horsetail Grass, Small Qinwang Grass, Blood Breaking Dan, Paper Back Golden Cow Grass, Big Lung Tendon Grass, Red Lung Tendon Grass, Deer Shou Tea, Deer An Tea. Chinese herbal medicine, efficacy expels wind-dampness, strengthens tendons and bones, stops bleeding. It is used in treating rheumatism and paralysis, lumbar and knee weakness, excessive menstruation, and chronic coughing and coughing.

Deer's tongue is a perennial evergreen herb with a height of 12 to 26 cm, all glabrous. Rhizome slender, creeping or oblique, nodes with triangular scale leaves, adventitious roots slender, from the nodes out, slightly branched. Growing in the valley under the forest or shady and wet place.