butterfly on a wild flower

background beautiful beauty biennial biology bloom blossom bright bristle bull butterfly cirsium colorful cute darnel ecology environment family flora floral floret flower flowerhead focus foreground genus grass green head insect insects invasive leaf musk natural nature noxious plant plumed prickles prickly purple rural season selective spear spiny stem thistle thorn thorny vibrant vulgare weed white wild wildflower wings zoology