Flower of a Papaver somniferum cultivar., photographed in ultraviolet light.
In ultraviolet the whole flower is much darker than in visible light. The petals retain their dark patches towards the base, but have less contrast with the rest of the relatively dark petals than in visible light, where the petals are quite bright.
The gynoecium is much darker in UV, along with the stamens and pollen grains being much darker as well.