Shades of pink by Ruby Wallau April 17, 2020 Share Facebook LinkedIn Twitter Colorful pink blossoms are seen on Centennial Common. With more than 1,400 individual trees, representing 143 different species, Northeastern’s Boston Campus is officially recognized as an arboretum. Photo by Ruby Wallau/Northeastern University Colorful pink blossoms are seen on Centennial Common. With more than 1,400 individual trees, representing 143 different species, Northeastern’s Boston Campus is officially recognized as an arboretum. Photo by Ruby Wallau/Northeastern University