Avicennia germinans

Black mangroves have shiny leaves and dark round seed cases. Their most distinguishing feature is their pnuemataphores, finger-like protrusions around the tree like slender, miniature cypress knees.
The northernmost extent of black mangroves in Florida is along the Matanzas River south of St. Augustine, where you can see them along the Bella Vista Trail at Washington Oaks Gardens State Park.
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