Stem Bark : Drug occurs in slightly curved or flat pieces,
0.5-2.5 cm thick, younger bark mostly channelled;
external surface more or less rough and rugged due to exfoliation
and vertical cracks, light grey to ash coloured; internal surface fibrous,
rough and reddish brown; fracture short and splintery; taste astringent.
Microscopically, mature bark shows a wide zone
of cork differentiated into upper and lower cork zones, forming
a rhytidoma; cork consisting of
tangentially elongated rectangular cells.
Seed : 2-5 seeds, compressed together into a mass resembling
a single seed, the whole seed enclosed
in a cream coloured, coriaceous covering, smooth,
oval or roundish, 1 cm long, 1 cm wide,
brownish black; taste astringent. Microscopically seed
shows cotyledons consisting of single
layered epidermis, mesophyll composed of isodiammetric,
thin-walled, parenchymatous cells and
numerous oval, rounded starch grains.