"OK so the grain is violated pretty well, so it is hickory."
It's hickory because it has characteristics of hickory.
When you encounter one of these old flatbows, it's a pretty good bet its made of hickory or lemonwood. The reason is this. These two woods lent themselves to mass manufacture. You could saw out a 2"X2" billet with the grain and mill the bow out with minor attention to the back.
For those who have little working knowledge with wood, the first thing you can do to narrow the playing field is survey the back of the bow. If its obvious that little attention was paid to following a growth ring on the back, then it pretty much narrows the wood to two species.
From there forward its simply learning to distinguish between hickory and lemonwood. That's pretty easy once you get the opportunity to actual handle and study these woods.
This is the reason I asked if the back has violated growth rings. It eliminates a lot of time and guessing as to the species.
Sometimes those of us who have worked with woods and are fairly proficient in their identity, become impatient over what we view as a routine ID. We ask that you ignore this human fault.