Field milk thistle (Sonchus arvensis)

Dmitry Poltavsky - Sonchus arvensis

Sonchus arvensis, the field milk thistle, field sowthistle, perennial sow-thistle, corn sow thistle, dindle, gutweed, swine thistle, or tree sow thistle, is a species of flowering plant in the daisy family Asteraceae. Sonchus arvensis is native to Europe, where it is widespread across most of the continent. It has also become naturalized in many other regions, and is considered an invasive noxious weed in some places. The plant produces conspicuous yellow flowerheads that are visited by various types of insects.