Sentence:  The spruce and fir trees crowded to the track on each side to welcome us, the arbor- vitae, with its changing leaves, prompted us to make haste, and the sight of the canoe-birch gave us spirits to do so. Sometimes an <WSD>evergreen</WSD> just fallen lay across the track with its rich burden of cones, looking, still, fuller of life than our trees in the most favorable positions. 
Meaning of the word marked with <WSD> tags:  A conifer tree.