藏药甘青青兰的生药学鉴别研究OA

Objective:A pharmacognostic identification of the Tibetan medicinal material Dracocephalum tanguticum Maxim was conducted.Different varieties of it were classified,and their morphological characteristics,as well as the cross-sectional and powder features under an optical microscope were analyzed.Methods:Through ancient books and documents,combined with methods such as character identification and microscopic identification,systematic research has been carried out.Results:Through literature research,the characteristics and botanical features of it have been clarified,as well as the classification of different varieties,such as Dracocephalum tanguticum Maxim,Dracocephalum calophyllum Hand,Dracocephalum forrestii W.W.Smith,Dracocephalum isabellae Forr,Saivia prattii Hemsl,Sali-ua przewalskii Maxim and Dracocephalum heterophyllum Benth,etc.Based on morphological observation,its unique tissue structure has been revealed.The microscopic identification results show the tissue structure in the cross-section of the rhizome,such as the epidermis,cortex and vascular column,as well as the epidermis,mesophyll,veins and epi-dermal hairs of the leaves.Under the optical microscope,the microscopic features such as vessels,epidermal cells,cork cells and starch grains are clearly visible.Conclusion:The microscopic characteristics of the cross-section and powder of the Tibetan medicinal Dracocephalum tanguticum Maxim provide important references for its pharmacological iden-tification.