Well here I might find an answer to a question which I've wondered about for well over half a century.
When I was a child we were given a lot of holly sticks each about a metre long, to use on our allotment. Apparently their original use was in making whips, and I remember hearing that holly was the best wood for that use. I've always wondered why.
This is the only reference that I can find:
"A show cane is a short, stiff cane that may be plain, leather covered, or covered with braided leather. Traditional canes are made from a stick of holly, cherry or birch wood, which is dressed and polished. They are rarely used now except in formal show hacking events."
I was going to say cottonwood as a tree with so many uses and virtues, yet also with so many difficulties. I've had trees try to harm me back for cutting them, but that's the only stuff which embroiled me with the tax man. Even so I couldn't hate it.
Red elderberry is a tree like shrub which grows prolifically in wetlands here since it is so toxic that nothing bothers it, except for the white flowers and huge bunches of red berries. Just looking at the stuff close up gives one an eerie feeling caused by the lack of insect nibbling on leaves. It is pretty from a distance, in spring with bunches of white flowers, and in autumn with huge bunches of red berries. A few years ago I juiced some berries in a steam juicer and the resulting wine brought back memories of college in Britain - and just as important didn't sicken me. Then of course I found out about how about 1 in 200 people are sickened by even the prepared berries in wine or jelly, so I quit while I was ahead. I don't even hate devil's club whick has "horridus" as part of its name but I guess I hate red elderberry.