Answer:
Pine (Pinus species) needles grow in bundles (fascicles) of 1 to 5 needles, while spruces and firs are attached singly. Those with sharp eyesight will also notice that spruce needles are attached to a branch by a tiny peg (pulvinus), while fir needles are attached directly to the stem with what appears to be some sort of suction cup.
Explanation:
