common brimstone butterfly on a milk thistle flower

asteraceae bad beauty blessed bloom blooming blossom brimstone butterfly cardus common corolla countryside daylight delicate entomology environment europe flight flower fly gonepteryx herbaceous insect italy marianum marianus meadow metamorphosys milk milkthistle morning moth natural natures nectar orange outdoor perennial petals pieridae plant rhamni season seasonal silybum spot springtime stem sulfur sunlight sunny terni thistle umbria wings yellow zoology