Our textual research shows that yanhusuo used in the ancient times is the plant Corydalis turtschaninovii Bess. which grows wildly in northeastern China today, and the cultural certified product C. turtschaninovii Bess.

• 通过考证认为:古代所用延胡索正品；即今产于东北各地的野生齿瓣延胡索(Corydalis turtschaninovii Bess.；)