It is an observation and research on the structures of different organs of Bupleurum scorzonerifolium and the distribution law of secretory canals in different organs by paraffin section method.It's revealed that:Firstly,the taproot of B.scorzonerifolium was formed by periderm,pericyclic parenchyma tissue and secondary vascular tissue from the exterior to its interior,and the pericyclic parenchyma tissue was a structure which was different from the common structure of herbaceous plants in dicotyledon.The st...