Combretum (Combretum quadrangulare) has become available on the ethnobotanical market, both as a dried leaf and 25X extract. Here's what one vendor states about the tree: Combretum quadrangulare is a small species of the family Combretaceae which can gro up to 10m high. It grows wildly or is specifically planted in Vietnam, Cambodia, Laos, Myanmar, and Thailand. Combretum is grown along the banks of rivers or arroyos. It's also found throughout Thailand especially in open, wet places. It is mainly smoked or chewed by the people of south Thailand since kratom is illegal in Laos, Thailand, and Myanmar. You rarely find it at the markets. It is mostly known locally. There is no supplier in the world offering Combretum, not even in origin countries, since farmers pick it for themselves. Edit: If a mod thinks I need to edit this post to hide the vendor more let me know and I will, however googling the name of the plant unfortunately reveals the same. This is basically the only info we so far have on what may be a very interesting ethnobotanical so I have opted to leave my post as is for now unless advised otherwise.