silver washed fritillary butterflies

argynnis asclepias august brown butterflies butterfly common east europe european female flowers fritillary friuli friulivenezia fvg giulia green herb insect insects italian italy lanceolate leaf leaves lepidoptera macrolepidopteran milk milkweed nature north ovate paphia perrenial pink plant plants rhizome rhizomes rhopalocera silkweed silky silver summer sunlight sunny sunshine swallowwort syriaca two union venezia virginia washed weed wild wings