Key to the Gymnosperms of the Southeastern U.S. -
Key to the Pines (Pinus)
Most needles shorter than 12 cm.


Needles are about 1 mm (0.04 in.) wide, not twisted, or only slightly twisted, and flexible -
Shortleaf pine (Pinus echinata)

OR

Needles are 1-2 mm (0.04 - 0.08 in.)
wide, often twisted, and stiff -
Pitch pine (Pinus rigida)

Needles ~1 mm wide, not twisted or slightly twisted, flexible Needles 1-2 mm wide, often twisted, stiff
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