Calophyllum inophyllum Linn is one of the important Ayurvedic drug plants of which practically all parts are used medicinally. Among these flowers and stamens are often used as a substitute for ‘Nagkesara’. This paper deals with a detailed pharmacognosy of the flower ofC. inophyllum. Physico-chemical constants, preliminary phytochemical studies, fluorescence analysis, behaviour of powdered drug with differnt chemical reagents and thin layer chromatography were also carried out.