This study deals with the reproductive biology of plant Costus pictus D. Don, commonly known as “Insulin plant” that have potential medicinal properties. It provides information regarding unique whorls of flower. Pollen and stigma morphology is studied through SEM analysis. The present studies were carried out on 50 inflorescence spike. Flowers of C.pictus D. Don have a labellum of five fused sterile stamens. Single fertile petaloid stamen is present.. Bilobed stigma appendage is attached to the wet bilamellate stigma. Flower shows co-occurrence of stamen and stigma. Pollen grains are somewhat asymmetrical in shape due to large size. Pollen are pantoporate as examined in SEM analysis. Pollen surface is found to be psilate during SEM examination but pores are ornamented. Floral nectary is present inside, above the ovary in prolongation region. Stigma receptivity was high in mature flowers while bud stage showed very few bubbles. The present study will help to scientists, taxonomists, and students to study floral biology of flower and inflorescence for identification, conservation and breeding purposes