Cephalanthus occidentalis, or the common buttonbush, is a small deciduous tree or shrub that is native to Southeast North America. Its leaves are elliptical and its flowers are spherical. Each flower is a cluster of white petals that are called achenes. It is used primarily as an ornamental bush. 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.