If possible, try to communicate: Rain Forest Research Institute (Jorhat, India) and or Forest Research Institute (Dehra Dun, India). I am sure you will get authentic Bambusa ventricosa sapling or even seed of this species.
You may also contact to Dr. Mohinder Pal (Chief Consultant) National Bamboo Mission, Room No. 105, B-Wing, Shastri Bhawan, New Delhi, INDIA. Email: [email protected]