Lady's Lace

Lady's Lace is a type of vegetation that exists in the region of Slaver's Bay on the continent of Essos.

Season 4
Daario Naharis gives Daenerys Targaryen a Dusk rose in a handful of flowers he has picked for her, ostensibly to show her the lay of the land around Meereen, but truly a thinly veiled attempt to woo her.

In the books
In the A Song of Ice and Fire novels, Daario does present Daenerys with some local flowers as they approach Meereen, but this occurs "off screen" between Daenerys's POV chapters: she recalls it as happening recently in her next chapter.