rose of Sharon

Short definition from Wiktionary

Noun

1. 1
   A flower of uncertain kind: perhaps Pancratium maritimum, which grows on the Sharon Plain of the coast of the Mediterranean Sea.
2. 2
   Hypericum calycinum, an evergreen flowering shrub native to southeast Europe and southwest Asia.
3. 3
   Hibiscus syriacus, a deciduous flowering shrub native to east Asia, and a national emblem of South Korea.