Stem bark occurs in small and thin, flat or slightly curved pieces, rough due to longitudinal striations;external surface brownish grey, internal surface grey and smooth, light in weight; .Microscopically mature bark shows a wide zone of stratified cork having lenticels at a few places. Secondary cortex is composed of thin walled, tubular, parenchymatous cells having groups of stone cells. Cortical fibres are in singles or in groups of 2-3, a few stone cells attached with cortical fibres. Prismatic crystals of calcium oxalate are found scattered in cortical cells and phloem parenchyma. Starch grains are simple and compound having 2-3 components, found scattered in cortical and phloem parenchyma cells. Powdered drug is greyish brown; shows single and groups of stone cells, prismatic crystals of calcium oxalate, simple and compound starch grains.