The gardener's magazine and register of rural & domestic improvement (1826)
Loudon, J. C. (John Claudius), 1783-1843, A. & R. Spottiswoode, printer, United States. Patent Office. Scientific Library, former owner DSI · London : Longman, Rees, Orme, Brown and Green · leaf 41
North America, and introduced by Douglas, according to Dr.Lindley, is, perhaps the handsomest hardy evergreen we yet c 2 20 New hardy Trees and Shrubs