From what I've read the Desert Ironwood plant, which is actuallly a legume and not a tree, kind of forms it's own eccosystem in the desert so cutting a plant is more than just cutting a plant.  Plants like Dersert Ironwood, Lignum Vitae, African Blackwood, Pink Ivory, and a lot of the Rose Woods have been overharvested and I wouldn't be a bit suprised if some of them end up on the CITES list.  We might eventually have to get re-export permits to sell a knife handled with some of those woods out of country or maybe not be able to at all.  In the meantime, I think that I'll restrict myself to purchasing form known dealers to increase the likelyhood that it has been legally harvested.
Doug Lester