papaverous

adjective2

1. •
   Of, pertaining to, or characteristic of the poppy.

   • Now instead of a smell of Delight our Mandrakes afford a papaverous and unpleasant odor, whether in the leaf or apple, as is discoverable in their simplicity or mixture. — 1650
2. •
   (figurative) Inducing sleep; soporific.

   • He reduced the chaos of Smith to some order, and his style is sufficiently classical, but not the less prolix and papaverous on that account. — 1837