Bamboo rice or moongil arisi.
Bamboo rice is actually the seed that is produced by a flowering bamboo at the end of its life span.
It is considered to be a forest produce and in most places only the local tribals are given access and allowed to collect these seeds. Given the height and thorniness of the bamboo,this is no ordinary rice harvest!
Bamboo rice is not commonly available since their flowering pattern is highly unpredictable and it may vary from a few years to up to 100 years for a bamboo plant to flower.