The title looks redundant but this flower is one of the first to bloom so it's named Harbinger of Spring. It's a tiny flower. Each bunch is about the size of a pencil eraser so you have to look closely to see it.
I found it in bloom yesterday at Raccoon Creek State Park Wildflower Reserve in Beaver County. So did Bob and Dianne Machesney.
(photo by Dianne Machesney)