Sweet Pepperbush (Clethra alnifolia)
Mountain pepperbush (Clethra acuminata)
Clethra is a genus of between 30-70 species of flowering shrubs or small trees. It is one of two genera in the family Clethraceae (the other being Purdiaea). The species may be evergreen or deciduous, and all bear flowers in clusters or inflorescences.