Stratholme Lily

Stratholme Lily is a decorative bouquet that can be equipped and carried in the off hand. Once, they bloomed all over Lordaeron.

Source
Sold by in Festival Lane in Old Stratholme. Can only be bought before the culling event starts.

Speculation
It is speculated that since Stratholme Lily shares the same icon as Arthas' Tears, this was the name of the flower before Arthas' purging of Stratholme in the Third War, after which it was renamed.