Ross Hoddinott / Green-veined white butterfly (Pieris napi) resting on yellow rattle (Rhinanthus minor) flower, Volehouse Moor Nature Reserve, Devon, England, UK. July.

Mike Read / Wildflowers growing in puszta grassland with Yellow rattle (Rhinanthus minor) near Tiszaalpar, Kiskunsag National Park, Hungary, June 2017

Mike Read / Wildflowers growing in puszta grassland with Yellow rattle (Rhinanthus minor) near Tiszaalpar, Kiskunsag National Park, Hungary, June 2017

Rod Williams / Yellow rattle flowers (Rhinanthus minor) and Wild Marjoram (Origanum vulgare) Hutchinson's Bank, New Addington, London, England, UK. August.

Stephen Dalton / Brimstone butterfly (Gonepteryx rhamni) on Yellow rattle flower (Rhinanthus minor) Somerset, England, UK, May.

Stephen Dalton / Yellow rattle in flower (Rhinanthus minor) Sussex, England, UK, July.

Stephen Dalton / Larger skipper (Ochlodes sylvanus) feeding on Yellow rattle (Rhinanthus minor) Rookery Wood, Sussex, England, UK. June.

Fabrice Cahez / Flower meadow with Meadow clary (Salvia pratensis), Yellow rattle (Rhinanthus minor), Sainfoin (Onobrychis viciifolia) and Ox-eye daisy (Leucanthemum vulgare), Vosges, France. May.

Fabrice Cahez / Meadow with flowers of Meadow clary (Salvia pratensis), Yellow rattle (Rhinanthus minor), Sainfoin (Onobrychis viciifolia) and Ox-eye daisy (Leucanthemum vulgare), Vosges, France. May.

Fabrice Cahez / Meadow with flowers of Meadow clary (Salvia pratensis), Yellow rattle (Rhinanthus minor), Sainfoin (Onobrychis viciifolia) and Ox-eye daisy (Leucanthemum vulgare), Vosges, France. May.

Andy Sands / Yellow rattle (Rhinanthus minor) flower head, Buckinghamshire, England, UK, June - Focus Stacked Image

Ross Hoddinott / Marbled White butterfly (Melanargia galathea) resting on Yellow rattle (Rhinanthus minor) flower, Volehouse Moor Nature Reserve, Devon, England, UK. July.