In full flower, this  iconic Chinese tree is a stunning spectacle.  Along every limb hang the large white bracts, in pairs of unequal length, sheltering the pretty inflorescences within and contrasting beautifully with the vibrant green leaves.  These have a heart-shaped base and serrated edges, not unlike mulberry or lime.  The bracts, reminiscent of doves or handkerchiefs (hence the common names) are green at first, but only after they turn white do various species of bees visit.