Sep 2, 2010 / News / Pat Chinn-Sloan Twitter Facebook Pinterest Email September Color Arrives at the Washington Park Arboretum (Part I) Clerodendrum trichotomum (Harlequin Glorybower) Clethra acuminata (Cinnamon Clethra) Hibiscus x ‘Tosca’ Rosa aff. Setipoda Sorbus decora (Showy Mountain Ash) Complete details.