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The plant produces conspicuous yellow flowerheads that are visited by various types of insects, especially hoverflies of the genus ''Eristalis''.References:
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Field milk thistle
Sonchus arvensis
''Sonchus arvensis'', the field milk thistle, is a species of flowering plant in the daisy family Asteraceae. It 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.
