One thing I have always thought about is the nature (or rather tendency) of osage orange and english yew to be knotty and twisted sometimes. I know not every osage tree is like that, and I only know what I hear about english yew, but it seems like it is not uncommon to hear accounts of both trees being knotty and twisted, etc. As well as osage and black locust both being ripe with thorns. What I am getting at, is I have thought a couple times if maybe man has been using these woods so much over time, whether for bow wood, or other purposes, that these woods have evolved through natural selection to be twisted and knotty and thorny, etc. Think about it, if there was a type of osage orange growing back in the day that had a tendency to grow perfectly straight with no twist or knots, it would be the first to get turned into a bow, or war club, or anything else for that matter. Although I know osage will typically just sprout shoots after being cut and grow right back, so this might just be a bunch of bs.