Apr 26, 2011 / News / Pat Chinn-Sloan Twitter Facebook Pinterest Email April Color Appears at the Washington Park Arboretum (Part II) Chaenomeles x superba ‘Knap Hill Scarlet’ Magnolia ‘Elizabeth’ Malus x purpurea ‘Lemoinei’ Rhododendron augustinii Viburnum carlesii (Koreanspice viburnum) Complete details.