Please help me ID this plant. Almost looks like a translucent lunaria, but it is not...
As long as none of the leaves we see belong to it (because none of them look right) it might be Dame's Rocket.
Saponaria Officianalis. Aka common soapwort, bouncing-bet, crow soap, and soapweed.
That is no soap wort or Saponaria. That would be from the carnation family, Cariophyllaceae and have 5 petals.
The plant on the pic has 4 petals and the long seed pods point to the Brassicaceae, like cabbage or rapeseed. Looks more like a Hesperis.
It's Hesperis matronalis - Dames Violet or Dames Rocket. Four petals - Brassicaceae. You can see the leaves down the stem.
Saponaria officinalis is Caryophyllaceae - five petals.
Curious - Linaria's post wasn't there when I replied. Sorry for the repetition.
4 petals is the tip off. My parents woods had loads of these. Dame's Rocket.