Dear Manudev Ji, Arunachal Pradesh is the best place in NE to study Arisaemas. I would suggest you to visit Kameng and Tawang districts of Arunachal Pradesh. Both East and West Kameng districts are full of Arisaemas. Further u can move to Tawang area where I've observed a few species. If you have more time in hand....try to visit Siang (either East, West or Upper) districts also.
You can also contact Dr. Joram Muthu who is working in Dera Natung Government College of Itanagar as an Asstt. Professor. He has worked on Araceae of Arunachal Pradesh and has good knowledge on Arisaema and their localities in Arunachal Pradesh. Hope this helps. Regards, Ritesh.
