Dig deeper at SERNEC, a consortium of southeastern herbaria.
You may also want to check The Pines of South Carolina
Spermatophytes (seed plants): Gymnosperms (non-flowering plants): Conifers: Pinales
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Keith Bradley kab_pinus_clausa_77939
September Highlands County FL
Archbold Biological Station
Bark gray, somewhat smooth on upper trunk, lower trunk with scaly ridges , per Woody Plants of the Southeastern US: A Winter Guide.