Fritillary on yellow flower

Fritillary on yellow flower

Observation - Fritillary on yellow flower. Description: Fritillary butterfly on unknown yellow flower. I'm looking for help to identify the flower (particularly) but also the butterfly. Any help will be much appreciated. Thank you

Fritillary butterfly on unknown yellow flower. I'm looking for help to identify the flower (particularly) but also the butterfly. Any help will be much appreciated. Thank you