Glory be.  Glorious.  Gloriful.

Morning Glory.  Ipomoea purpurea. 

To the Victorians, they symbolized "Love in Vain."

Moonflower, which opens at night. A relative of the Morning Glory. Its buds are spiraled like a unicorn's horn, and its blooms are white. The moonflower symbolizes "Dreaming of Love" in the language of flowers.