I read that also. I have heard from two different sources, and got two different answers. One who claims to make replica bows said black willow, which I tried but with not so good results. I really doubt that this is correct because black willow is native to the southeast, with Texas being the farthest west reported native range. The other source said desert willow. I find this a lot more likely because it is native to the areas where they lived. It is a much better wood than any of the willows. I have gone to a few ancient sites and found the desert willow growing in the area. BTW It is not a true willow.