I looked up firewood / ivan-čaj, it says its tea was widespread in Russia before proper tea became common, and its main German name is so long that package labeling would look a bit funny: Schmalblättriges-Weidenröschen-Tee. If it's sold here at all, perhaps it gets shortened to Weidenröschentee, Iwantee or one of the plant's alternative vernacular names, like authors choosing fashionable, not-overly-long pen names.
>sea buckthorn tea is really good
I bet it is; I like the fruit's taste as long as its sourness is kept in check. But wouldn't the heat destroy the fruit's high vitamin C content?
I just remembered I have a special Chinese old tea (but can't remember what it's called) from Xishuangbanna, perhaps from the time of what's euphemistically termed Cultural Revolution
; if so, perhaps it was made by convict labour? I don't want to drink it so will try to give it away.