Rehmannia root ) Li boshi. exfisch。 etmey。 Scrophulariaceae perennial herb, 30 cm tall, fleshy roots when fresh, yellow stems, purple stems under cultivation conditions. The diameter can reach 5.5 cm, the leaves are oval to oblong, the veins are concave, and the flowers are arranged at the top of the stem in a general shape. The corolla is purplish red outside, yellow purple inside, and the anther chamber is oblong. Capsule oval to oblong, flowering and fruiting period is from April to July.

Born in the hillside and roadside wasteland at an altitude of 50 ~ 1 100 m, it is named Rehmannia glutinosa because its underground roots are yellow and white. Its root is one of the traditional Chinese medicines, which was first seen in Shennong Herbal Classic. Medicinal materials are divided into Radix Rehmanniae, Radix Rehmanniae and Radix Rehmanniae Preparata according to processing methods, and their medicinal properties and efficacy are also quite different. According to the efficacy classification of Chinese materia medica, fresh rehmannia glutinosa is a medicine for clearing heat and cooling blood; Rehmannia glutinosa is a tonic In addition, Rehmannia glutinosa blooms in early summer, with a large amount of flowers, red and purple, which has good ornamental value.