Comment by philg_jr

Another obscure-ish tea that is seems to be gaining popularity is guayusa (mostly being pushed under the brand Runa). It is another holly from warm regions, I think from rainforests in South America. I'm a big fan of the moderate caffeine content and the ability to steep it for long periods to get more caffeine out of it, without it getting bitter. It is amazing as a summer/warm weather high-caffeine iced tea. You can buy in loose tea form by the pound from Amazon for about $20.