Corolla of family Fabaceae: Corolla 5, polypetalous, aestivation descending or vexillary imbricate, papilionaceous with five unequal petals-posterior largest petals called standard which overlaps two smaller lateral petals called wings, the latter overlap a boat-shaped structure called keel, which is formed by the two anterior petals fused lightly on the anterior side, lateral and anterior petals are scale-like in Erythrina Indica.