boughs of, were to be carried in festive procession on the first day of the feast of Tabernacles ( Leviticus 23:40 ). This was probably the olive tree ( Nehemiah 8:15 ), although no special tree is mentioned.

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.