Can you post a pic of the seeds with a penny or some other object as a reference for the size of the seeds?
I too searched for needle and thread plant and just got grasses.
I wonder if it might be spider plant (Cleome hassleriana)?
Wild guess on my part but you could search for images of spider plant seeds to see if yours match or not.

Good luck! :)

-Robert

I also have some seeds and was told the flower was a needle and thread. I have pictures of the plant in full bloom. It's a beautiful plant. I don't know how to post pics on here, or if I can, but if you wanted to see them I could email them or text them to you.