Sentence:  Without the wall a birch-tree shows / Its drouped and tasselled head; / Within, a stag-horned <WSD>sumack</WSD> grows, / Fern-leafed, with spikes of red. 
Meaning of the word marked with <WSD> tags:  Any of various shrubs or small trees of the genus "Rhus" and other genera in Anacardiaceae, particularly the (elm-leaved sumac), (Sicilian sumac), or (tanner's sumac) ("Rhus coriaria").