Thanks for the good words Mic, Let me make it clear that the word 'Tenga' in Assamese means 'Sour'. It is referred for some other sour lemons and not specific to Citrus maxima only. (Thanks goes to Mr. Pankaj Oudhiya who reminded me to make it clear). In Arunachal Pradesh, more than 38 indigenous communities are there who often use 'Assamese' as a common language. In their own language, the names may differ.
Regards, Ritesh.