Explanation

Pisum belongs to family-Fabaceae. In this family, flower is bisexual and zygomorphic; corolla is polypetalous papilionaceous and zygomorphic; corolla is polypetalous papilionaceous and with vexillary aestivation; andriecium is papilionaceous and with vexillary aestivation; androecium is diadelophous with dithecous anther; and gynoecium has monocarpellary, unilocular and superior ovary with marginal placentation having many ovules.