The roots, seeds, flowers and young leaves of the lotus plant are all edible. Lotus root is very commonly used in stir fries, soups etc. It is also pickled and used in salads. The seeds are a seasonal delicacy or are made into lotus bean paste used in cakes and desserts.The flowers and leaves commonly consumed, but can be.Leaves are often used to wrap zongzi, but are not eaten.
I'm not at home right now, but will post some examples later.