Solidago juncea, the early goldenrod, plume golden-rod, or yellow top, is a herbaceous perennial native to eastern and central United States. Leaves around the base of the plant can be as much as 1 foot long. One plant can produce as many as 450 small yellow flower heads in a large, showy array. Wikipedia
You can help scientists understand how climate change is impacting this species by using the phenophase guide below to observe its lifecycle in Nature's Notebook.