Bark on upper sections of trunk is reddish to red-brown, and in plates;
seed cones persist on branches, are often long serotinous, and are usually
armed with a small prickle - |
OR |
Bark on upper sections of trunk is gray, and more or less smooth, appearing
slick; seed cones tend to fall after maturity, are not serotinous, and
are unarmed or bear a minute, deciduous prickle - |
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