After the end of the Second World War in 1945 Canada decided to replace the high values of the War Effort Issue with designs symbolic of the simple, peaceful and industrious life of Canada.
Page 105, Hansen’s Guidebook & Catalogue of Canadian Stamps, 1970.
This photo of Staghorn Sumac [Rhus typhina] was taken at Trout Lake, Hermon, NY, on 29 July 2011. It is a member of the Cashew (Anacardiaceae) family. Harvesting Color shows it yielding a light brown dye with an Alum mordant and a green/gray-green with an iron one (Pages 100-103).
USDA Plants Listing: http://plants.usda.gov/java/profile?symbol=RHTY