there's an interesting plant that it's used in Siberia, Mongolia...
Rhododendron adamsii. There's not so much worthy info in the net, as far as I researched,
the smell of the plant (leaves and stems) is wonderful, full of nuances, it's parfum material.
There's an study comparing its adaptogenic effect with rhodiola rosea, seems to work better with 50% methanolic than with less or more solvent.
I had some tea of it (piney, honey-like and delicious) that wasn't very strong and probably my batch is weak (I don't trust that vendor anymore) but I think it has some real effects, like increased wakefullness.
It was used for long days with physical efforts like not sleeping and moving a lot.
I read (and this is the interesting point) that it was used by shamans to induce visions, when taken in big amounts.
Maybe it's ethnobotanical "fake news" but it may be true, it's difficult to tell since the amount of actives in white wings/sagan dalya (their popular names) are astounding, more than 150.... and a lot of new compounds. Sadly there's barely no info..
Just for its flavour, scent and beautiful color of the tea is worth a try, in fact I'm gonna do a tea now...
Not sure if it has grayanotoxins but I never felt any effect commonly related to grayanotoxins, the times I used it
Edit: having a closer look into the paper I found that the period on the year on which it's collected change a lot the extracts potency, from having barely no effect to an effect more potent than R. Rosea.
I link the paper here, for those interested:
Adams' rhododendron (<i>Rhododendron adamsii</i> Rehder) or Sagan Dalya tea is a famous Siberian evergreen medical plant of the Ericaceae family used in traditional medicines of Buryats, Yakuts, and Mongols as a tonic, stimulant, and adaptogenic drug. The high popularity of <i>R. adamsii</i>...
pubmed.ncbi.nlm.nih.gov