Here's a copy of a great list on paleoplanet:
WALNUT: black .55. Semi-ring-porous, easy to work, elastic for its mass, similar in performance to cherry, but more tension-safe. Will try to chrysal where cherry wont. A wonderful, overlooked bowwood. Bows can be all sapwood or all heartwood, or mixed, sapwood taking a bit more set in compression. The off-white sapwood can be worked down to 25% or so of limb thickness, creating appealing contrast with the almost black belly. Very high heartwood extractive level, so as with similar woods, it may be more resistant to water absorption. Its reported not to warp with rising and falling humidity, possibly for this reason.
WALNUT, European .56. Design as per Black. Not as pretty, but makes a nice bow. Strong enough in tension to tolerate being a backward bow: the crowned sapling surface as belly, the split back surface tillered.
WENGE. About .67, determined by comparing same-size samples to known SG woods. African hardwood. Common in hardwood yards. Oils to a rich near-black. Looks impressive with a white hickory or rawhide back. When worked, wenge dusts up badly on its back, causing backs to pop off unless cleaned unusually well before gluing. The wood seems somewhat oily. Of possibly 100 boards observed, all were fairly thin ringed, but with even thinner earlywood. Wenge is more brittle in tension than same SG pecan. It wont allow the same degree of back fiber violation or as much overbending before breaking. A Uniform Bend Test sample took of set when bent 3.5 at 24.5lb An average of three osage tests yielded 3.5 at 34lb. So, at equal thickness Osage and wenge were equally elastic, but wenge would have to be about 30% wider to have equal drawweight at equal set. This is based on just one wenge test, but comports with wenge bows Ive made.
Also, pecan is a type of hickory, so it's real good for bows especially with the selfbows.
Here's the link to that paleoplanet post:
http://paleoplanet69529.yuku.com/topic/6213/t/List-of-Potenial-Bow-Wood-Species-With-Comments.html