Thanks, Pat. Exactly the kind of info I was looking for. I think as you get further south into the brush country of South Texas, you will find huge thickets of Youpon--not so much in central and south central. I have a couple of pastures in Lavaca County where the stuff grows like a barely penetrable understory with Live, Post, And blackjack oak, all mixed with mesquite an kudzu thorns. The denser the growth, the more competition for light and the greater tendency for stalks to shoot straight up or outward in a nice curve.
I know the Comanche primarily used Dogwood, but I'll bet, even though I have no proof, that they also used Youpon.
Russ