Step 1: Understanding the Concept:
The identification is based on the morphological characteristics of the plant family Papaveraceae.
Step 2: Detailed Explanation:
The diagram displays a plant with a prominent flowering structure and a large, rounded fruiting body known as a "capsule."
The specific shape of the capsule and the delicate, broad-petaled flowers are diagnostic features of Papaver somniferum.
Step 3: Final Answer:
The plant identified is Papaver somniferum.