Showy Mountain Ash or <PERSON> (Sorbus decora), a 6-10m tall deciduous tree native to northeastern North America. The clusters of red berries follow spring-borne heads of tiny white to cream flowers. The effect is similar to the common Mountain Ash (Sorbus aucuparia) but the leaflets are usually larger and darker and the red fruit (as opposed to orange for S. aucuparia) ripens later, often persisting beyond leaf fall. More Sorbus Photos. Rosaceae