Various shades of purple are a common colour among lots of the flowers of high summer. A small sample from a short walk on the Riverside Project reserve in Stratford on Avon last month.
Marsh woundwort has a name giving a clue to the medicinal properties it was presumed to have. Most teazle flowers are a delicate shade of purple, though some are so pale as to be almost white. The many species of thistle come in multiple shades of purple.