I have found references of only Peepal and Neem trees to be worshiped in the Indus Valley civilization. The images of these trees appear on many seals found in the excavations. I doubt if there would be any other trees to be worshiped as no other trees are mentioned apart from these two.
I started this topic.still now Idid not collect the five names.Here I am guessing-
1.peepal 2.neem 3.tulsi 4.baniyan and 5.durba grass.
If these are correct post here.