Marbled white butterfly (Melanargia galathea), feeding on greater knapweed flower (Centaurea scabiosa), Wiltshire, England, United Kingdom, Europe

Leafcutter bee (Rhodanthidium siculum) foraging on round-headed knapweed flower (Centaurea sphaerocephala), Algarve, Portugal, Europe

Hoverfly (Volucella bombylans var. plumata) visiting a greater knapweed flower (Centaurea scabiosa) in a chalk grassland meadow, Wiltshire, England, United Kingdom, Europe

Small skipper (Thymelicus sylvestris) nectaring on greater knapweed flower (Centaurea scabiosa) in a chalk grassland meadow, Wiltshire, England, United Kingdom, Europe

Marbled White Butterfly on Knapweed in Oxfordshire, England

Marbled White Butterfly on Knapweed in Oxfordshire, England

Queen of Spain Fritillary (Issoria lathonia) sitting on a flowering Brown Knapweed, Brownray Knapweed (Centaurea jacea)

Perennial cornflower (Cyanus montanus), bud, Germany, Europe

Knapweed fritillary on dry grass by end of summer