According to the corolla:

Sympetalous: When the petals are joined , wholly or partly.
Polypetalous: If the petals are not joined.

Actinomorphic: Can be divided into two exact parts, if a line is drawn from one side to the other, reaching the centre, no matter where the line is drawn .( radial symmetry)
Zygomorphic: Only two symmetrical parts are possible if a line is drawn from one side to the other, reaching the centre. With a single plane of symmetry ( bilateral symmetry)