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Key
to Genera 2 |
| COUPLET 7 |
Needles in bundles of 2 or more (except for Pinus monophylla), bound together at the base; female cones usually distinctly pine-cone like.
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Needles in sworls, arising from a woody spur from the branch.
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Needles arising singly from the branchlets.
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| COUPLET 8 |
Female cones upright on branches (a), usually clustered near the top of the tree; female cones disintegrating on maturity commonly leaving a central core (b); needle scars large, round, and depressed (concave); needles lack a thin neck (petiole) at the base.
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Not as above.
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| COUPLET 9 |
Cones hanging from the branches, but back from the tip of the branch; needles each arising from a woody peg on the branch.
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Not as above.
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| COUPLET 10 |
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Cones with conspicuous tridentate
cone scale brachts; cones hanging from branches, not upright; Leaf scar
on branch small, raised; base of the needle constricted forming a petiole.