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