近缘种药材垂盆草与佛甲草的比较鉴定

目的:对属于近缘种、外形极似的药材垂盆草与佛甲草进行鉴定比较研究。方法:采用显微鉴定法研究两者茎的横切面及粉末的显微特征;采用薄层色谱比较两者的异同。结果:垂盆草与佛甲草茎横切面组织特征十分相似,但在导管数目、髓部形状及含紫红色物质的细胞数目等有显著差异。对8月份样品而言,前者导管数一般仅有35-58个,髓部多呈三角形;后者则多达75-150个,髓部呈"Y"形。两者的薄层色谱也有较大不同。此外,不同采集期的样品在显微特征上存在某些明显差异。结论:研究结果为两种药材的应用提供了鉴定参考依据,并提示近缘植物药的显微鉴定应注意排除共性。

Comparison and identification of Herba Secti and Herba Sedi Linearis

Objective: To research identification methods of the two crude drugs from the original plants with close relationship and very similar macroscopic shape,"Chuipencao"(Herba Sedi) and "Fujiacao"(Herba Sedi Linearis).Methods:Microscopic technique and TLC were used to determine the pharmacognostical characters for identification purpose.Results: The microscopic observations showed that the tissue structures of the stems and the microscopic characters of the powders were very similar between the two herbal drugs.But there were significant differences in number of the vessel,shape of the pith,and number of the purplish-red cell.For the samples collected in August,number of the vessel of the former usually was only 35-58,while the latter was 75-150.Pith of the former usually was in the shape of a triangle,while the latter was in the shape of Y.The TLC result had also obvious difference between the two drugs.Besides,there were some differences of the pharmacognostical characters of the samples collected in distinct periods.Conclusion: The results provided scientific basis for the identification of the two crude drugs and suggested that the general microscopic features be not important in the microscopic identification of the crude drugs from the original plants with closer relationship.