This purple flower has burst out in my gardens and along country roads. It is Hesperis (Hesperis matronalis).
It has many names including dames rocket, damask violet. dames violet, dames wort, dames gilliflower, night-scented
gilliflower queen's gilliflower, rogue gilliflower, summer lilac, sweet rocket, and mother of the evening.
For years I thought this was phlox. They are different in that hesperis has altertnately arranged leaves and four petals per flower
while phlox has alternate laves and five petals.