Step 1: Understanding the Concept:
Opioids are drugs that bind to specific opioid receptors in the central nervous system and gastrointestinal tract.
Step 2: Detailed Explanation:
The main source for natural opioids is the Opium poppy.
Its scientific name is \textit{Papaver somniferum.
The drug is obtained by extracting the latex from the unripe capsules (seed pods) of the plant. Morphine is then extracted from this latex.
Step 3: Final Answer:
Scientific Name: \textit{Papaver somniferum}. Part: Latex.