This is what is locally called honey locust. I've seen it mentioned more than once on forums and also in the wikipedia article that it is not a nectar producing plant despite it's name. The thing is it's been covered up for about a week with honey bees, bumble bees, butterflies, tiny little wasps, and stuff I can't even identify. Everything working furiously - no pollen visible in pollen baskets.
So, what's up with that?