Stephen Dalton / Painted lady butterfly (Vanessa cardui) resting on Bugle flower (Ajuga sp) with wings open, UK

Andy Sands / Pearl-bordered Fritillary (Boloria euphrosyne) on bugle flower. West Sussex, England, June.

Andy Sands / Pearl-bordered Fritillary (Boloria euphrosyne) with wings closed on Bugle flower. West Sussex, England, June.

Stephen Dalton / Small pearl bordered fritillary butterfly (Boloria selene) on Bugle flower (Ajuga sp) UK

Stephen Dalton / Pearl bordered fritillary butterfly (Brenthis / Boloria euphrosyne) on Bugle flowers (Ajuga sp) UK

Stephen Dalton / Painted lady butterfly (Vanessa cardui) resting on Bugle flower (Ajuga sp) with wings closed, UK

Paul Harcourt Davies / Tenore's bugle (Ajuga tenore) flowering in the Simbruini Mountains NP, Apennines, Italy.

Paul Harcourt Davies / Geneva bugle (Ajuga genevenis) flowers, Lazio, Italy

Brian Lightfoot / Bugle (Ajuga sp.) in flower. Scotland, UK.