Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
| 1 Leaves strongly 3-veined from the base, the venation otherwise pinnate; fruit a drupe with thin flesh |
| 1 Leaf venation pinnate throughout, the venation strictly pinnate; fruit dry, a samara (flat and winged) or nutlike (with or without fleshy protuberances). |
| ..2 Fruit a samara (flat and winged); primary lateral veins mostly parallel and unforked to the leaf margin |
| ..2 Fruit nutlike (globular, with or without fleshy protuberances); primary lateral veins either mostly parallel and unforked to the leaf margin, or mostly forking before reaching the margin. |
| ....3 Fruit with numerous fleshy protuberances; primary lateral veins mostly forking before reaching the margin; [small trees of swamp forests of the Coastal Plain from se. NC and SC southward] |
| ....3 Fruit lacking fleshy protuberances (though irregular in shape); primary lateral veins mostly parallel and unforked to the leaf margin; [planted horticulturally, rarely persisting or spreading weakly] |