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True Fir (Abies)
Leaf scar is round; needles flat and spirally arranged on branches;
central leader stout and erect.
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Douglas Fir (Pseudotsuga)
Branches posses many pendant side branches; needles flat (narrower
than true firs) and extend from branch in all directions; cones with
three pointed bracts.
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Hemlock (Tsuga)
Needles soft and flat (sometimes triangular) spirally arranged on
stem, with slender peticle and lacy in appearance; about 1/2 to 3/4
inches long; cones at end of branchlets - about 3/4 inch long.
Central leader of the Hemlock has a distinct drooping habit.
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Spruce (Picea)
Needles diamond shaped (or rounded) in cross section, pointed and
sharp to the touch; attached to woody bases or peticles which remain
after needle falls and give naked branch a rough appearance.
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