Wingspan 15-19 mm.
When freshly emerged, this species can have a distinctly rosy or purplish tinge, which gives rise to the scientific name. However this can fade quite quickly to a dull buff colour.
It is distributed in the southern half of England and Wales, though not particularly common. There are also occasional records of its occurrence in Scotland and Ireland.
Flying in June and July, the species frequents rough pasture and similar habitats, and the moth will visit light.
The larvae feed on the roots of sow-thistle (Sonchus spp.) and dandelion (Taraxacum).