Needles in bundles of 2. If bundles of 2 and 3 occur in the same species (either on the same tree or between populations), that species will key out using either of these two options.

GO TO COUPLET 28

Needles in bundles of 3. If bundles of 2 and 3 occur in the same species (either on the same tree or between populations), that species will key out using either of these two options.

GO TO COUPLET 34

Return to Couplet 16

Needles 8 to 10 inches long. [Bundles of both 2 and 3 needles occur in this species]

Slash Pine (Pinus elliottii)

Needles shorter than 6 inches

GO TO COUPLET 29

Return to Couplet 27

Distribution boreal; needles 4 to 6 inches long

Red Pine (Pinus resinosa)

Distribution not boreal (distribution is temperate or southern); needles shorter than 4 inches long (except for Shortleaf Pine)

GO TO COUPLET 30

Return to Couplet 28

Twigs rough and scaly below the portions with needles. [Needles occur in bundles of both 2 and 3]

Shortleaf Pine (Pinus echinata)

Twigs smooth, not rough and scaly below the portions with needles.

GO TO COUPLET 31

Return to Couplet 29

Needles strongly twisted

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Needles straight

GO TO COUPLET 33

Return to Couplet 30