Microstructure of Nutrition Organs of 12 Strains of Polygala tenuifolia from Shanxi

The root,stem and leaf of Polygala tenuifolia Willd.in Shanxi were studied with paraffin sectioning,and their microstructures were observed,moreover,the root radius,xylem,phloem,phellem and stem radius were measured.The data set were studied by statistical method.The results showed:The periderm was thick and phellem cell near rectangle,the arrangement was neat compactly.The proportion of phloem was more 1/2 than cross section and the phloem-ray was not in evidence;the xylem was strong and xylem-ray was in evidence.But there were differences in the ply of the phellem layer,size of phellem cells,proportion of the phloem and the type of vessel.The biggest proportion of the phloem in cross section was P.tenuifolia from Taiyuan.The reticulate vessel was existed in P.tenuifolia from Xinjiang,Pingyao,Taiyuan,Shouyang,Yingxian and Datong.The other P.tenuifolia were ring vessels or spiral vessels,or a combination of both.