43. Leaves 4 to 10 inches long black jack oak [218] 43. Leaves 2 to 3 inches long water oak, duck oak or pin oak [217]
44. Leaf notches pointed chinquapin oak [216] 44. Leaf notches rounded swamp chestnut oak [215]
45. Leaves 6 to 12 inches long bur oak [214] 45. Leaves less than 6 inches long [46]
46. Leaves 3 to 5 inches long post oak [212] 46. Leaves less than 3 inches long scrub oak [213]
Leaf Margins Smooth or Wavy, Not Lobed or Toothed
47. Vines [48] 47. Not vines [50]
48. Leaves 2 to 4 inches long Carolina moonseed [229] 48. Leaves 4 to 10 inches long [49]
49. Leaves deeply heart-shaped at base, wooly, leaf margin not extending beyond base of stem, not angled or lobed wooly pipevine [228] 49. Leaves not always deeply heart-shaped at base, not wooly, leaf margin extending slightly beyond base of stem, leaves often angled or shallowly lobed Canada moonseed (very rare) [230]
50. Leaves broad, at least nearly as broad as long, more than one main vein at base redbuds [240] and [241] 50. Leaves decidedly longer than wide, one main vein at base [51]
51. Leaves smooth or shiny above [52] 51. Leaves not smooth, or shiny above southern hackberry [225]