The difference between fengshui chuanshanlong and guodilong.

Fengshui Dioscorea nipponica is a wild yam, and earthworms are used to relieve cough. Dioscorea nipponica, alias wild yam, string earthworm, ground keel, etc. It's a perennial herb twined with vines. Dioscorea nipponica was originally called earthworm. Dioscorea nipponica Makino is a herbaceous plant, and its rhizome is used as medicine to dispel wind and remove dampness, promote blood circulation and dredge collaterals, and relieve cough. Lumbricus is what we usually call earthworm, which has the functions of dredging meridians, promoting blood circulation and removing blood stasis, and preventing and treating cardiovascular and cerebrovascular diseases.