Flower biology in Tecomella undulate (Roxb.) Seem. (Bignoniaceae)

Tecomella undulate (Roxb.) Seem. is deciduous or nearly evergreen tree that is highly valuable due to showy and beautiful flowers, resistance against extereme temperature and drought, stabilizing of shifting sand dunes, medicinal properties, wood production and so on. In this study, morphology and anatomy of flower was surveyed. The inflorescence is raceme-cyme; the perianth is pentamerous and adnate; the calyx is persistent, regular and cup (bell)- shaped. The corolla is tubular-cup shaped, bilobate and irregular in the top. The androcium contains four functional and almost didynamous stamens and one staminode. The anthers are dorsifixed, at maturation apifixed and pollen sacs seem somewhat biloculate due to grown placentoid. Epidermal celles are tangentially elongated and function as endothecium. Tapetem is secretory type. Ggynoecium is bicarpillary, syncarpous with bilocular and elongated ovary, long and open style and bilabiate stigma. Ovary is located on well-developed nectary disc and has many anatropous, unitegmic; tenuinucellate ovules. Flowers open in the morning and are protandrous, as the stamens dehisce after their opening but stigmas are receptive in the afternoon. Pollen grains are heteromorphous specially dimorphous, tricolpate with reticulate sculpture. No seeds form in this species in under study areas.