Lagerstroemia indica, Crape myrtle
A stamp issued by Indonesia, in a four stamp series, in 1965,
This plant seems to like the Greek climate as it is quite common in gardens and pavements, especially in Sparta where the climate is cooler and damper than the climate we experience here in Corinth. Looking through my diaries I discovered that both photos were taken in Sparta, the flowers and bee in August 2012 and the red leaves in November 2011.
There are many references to Lagerstroemia in THE MEDITERRANEAN GARDEN, I am pointing you to the October 2018 issues, number 94 for you to read
RHS PLANT TRIALS by Sabatino Urzo