A few meanings, the Ancient Greek + Romans would plant outside their home to protect from curses and evil spirits. 

Whilst medieval maidens wore snapdragons in their hair to ward off unsolicited romantic attention + a protection from gossip. 

The tiny intricate flowers of Ammi or Queen Anne's lace show delicacy + beauty so can often be linked with grace + femininity. 

As the flowers go over, they blooms close up into a nest shape, providing a nest shape which is often used by insects for protection. 

The one flower I think we are all familiar with! Synonymous with romance + love.

Greek legend claims the first red rose bloomed from the blood of Aphrodite's dying lover, Adonis, and the tears she shed over him. 

In Victorian times, colours of roses indicated the type of affection.