Simplify the following text for a Grade 5 native English-speaking person.
Original: Syringa vulgaris ( Lilac or Common Lilac ) is a species of Syringa in the olive family Oleaceae , native to the Balkan Peninsula in southeastern Europe , where it grows on rocky hills .
Simplified: Common Lilac ( Syringa vulgaris ) is a species of plant . It belongs in the family Oleaceae .