Although the wood of choice is usually osage orange, many of the plain's tribes made bows from ash or hickory. Traditionally these bows were shorter--under 56 inches, and implemented a wide-- 2 inches or more, thin limb design. Many, later era bows also were backed with sinew which adds poundage and helps protect the wood from failure. Depending on what era and what purpose you want to make your bow these bows weren't meant to be drawn 28 inches and originally were designed for shooting rabbits, birds and other small game; not just deer or elk.
There are several different bow designs and you'll probably want to do a little research. A good book I came across several years ago was written by Douglas Wallentine, I believe he is Lakota if I remember. He covers various woods, bow designs, arrows, fletching, string-making, etc. I recommend one of his books if you can get hold of one. Good luck.
