A Bajoran flower that was the favourite of Kira Nerys's mother Meru, and the detail Dukat uses to prove he knew her in Wrongs Darker Than Death or Night.
The Bajoran lilac is a flowering plant native to Bajor. It appears in the Deep Space Nine episode Wrongs Darker Than Death or Night, set in 2374.
Kira Nerys marks her late mother's birthday by setting out Bajoran lilacs, the flowers her father always said Kira Meru loved. That night Dukat contacts her from hiding and claims that Meru did not die in a refugee camp but lived for years as his mistress. He offers her fondness for the lilacs as proof that he knew her well.
Shaken, Kira consults the Orb of Time and travels back to the occupation to see the truth for herself. The flowers frame the story at its beginning and remain a reminder of how little she really knew about her mother.