Plea For an ID

I'm known to wander through the woods with bag and trowel in hand, just in case I come across a plant that needs relocating to our gardens. We have friends that own a woods near here that holds a treasure trove of natives and they've given us permission to wander at will and take what we want.

We don't want to abuse the privilege, so we've only been there twice this summer, once with the owner along. On the first trip there, in May, I noticed a clump of strappy foliage growing at the base of a tree. The leaves were about ten inches long and originating from a central point in the ground. Upon digging, we discovered it was a bulb.

It had the tell-tale aroma of onion, though ever so slight, so we determined that it was an allium of some sort. It was May when we planted them in a shady spot in our garden, which was like that of its origin, though alliums generally like sun. It grew well all summer, then in mid-summer it put up a stem with a bulbous bud at the tip.

After what seemed to be an extraordinarily long time, it produced a round ball of little white flowers that were pretty unremarkable. The flower head was no more than an inch in diameter and the bloom didn't last long. But the seeds that are now like little beads on the seed head are extraordinary.

They're shiny, pearly, and the prettiest shade of midnight blue. They border on being iridescent and have been perched atop the seed head for a couple of weeks now. I've searched online to try and determine what native allium this might be, but haven't been able to find it.

Any ideas?