Colours abound in the summer hedgerows. I included a picture of Rosebay Willowherb a few days ago and they are indeed colourful plants, but take a closer look at the individual flowers of this stately perennial.
You might know the name of the next flower from the side of a skin preparation in the medicine cabinet! Evening Primrose (Oenothera biennis), is a member of the same genus as the Willowherbs and is often grown in gardens for it's large, bright yellow flowers.
Hypericum terapterum). Hypericums are also well-known as garden shrubs (my mother has a large Hypericum 'Hidcot' in her garden turned into high-rise accommodation by the sparrows).