ragged robin
noun
: a perennial herb (Lychnis flos-cuculi) of the pink family cultivated for its pink flowers with narrow-lobed petals
Example Sentences
Recent Examples on the Web Except, that is, for an untamed patch that contains what many people might deem weedy eyesores: tufted vetch, ragged robin and knapweed. 
Kathryn O’shea-evans, WSJ, 15 July 2021 Poppies, campion, daisies, ragged robin, and many other native wild flowers are now on display in the famous gardens. Elizabeth Gulino, House Beautiful, 16 July 2019
Kathryn O’shea-evans, WSJ, 15 July 2021 Poppies, campion, daisies, ragged robin, and many other native wild flowers are now on display in the famous gardens. Elizabeth Gulino, House Beautiful, 16 July 2019 Word History
First Known Use
1731, in the meaning defined above