I've never seen any osage, so it's pretty exotic to me!
Black Widow's base model bows are, I think, stained actionwood or maple or something (please correct me if I'm wrong).
Their mid-range bows have an "ironwood" riser and stained, vertically-stacked bamboo (is that a term for "lamboo"?) limbs.
Their top-of-the-range bows have a riser of any exotic wood on offer, and veneers of that or other timber over the vertically-stacked bamboo limbs, except in the case of osage bows, which don't utilise any bamboo, just the osage (and glass / carbon).