Rehmannia glutinosa (Latin scientific name: Rehmannia glutinosa (Gaetn.) Libosch.ex Fisch. et Mey.) is a perennial herb of the family Scallophora and Rehmannia rehmannia genus. It is named Rehmannia Rehmannia because its root tuber is yellow and white. According to the processing method, it is divided into fresh rehmannia rehmannia, dry rehmannia rehmannia and cooked rehmannia rehmannia, and its medicinal properties and effects are also different.
Health rehmannia more irregular clumps or oblong, middle bulging, slightly thin ends, some small, long, slightly flat and twisted, brown or brownish gray surface, extremely wrinkled, irregular transverse lines. Weight, quality is soft and tough, not easy to break, section brown to color or black color, shiny, sticky. The air is slightly sweet.