33. Lobed or coarsely toothed leaves on vines [34] 33. Lobed or coarsely toothed leaves not on vines [38]
34. Leaf margins smooth, though sometimes slightly lobed [35] 34. Leaf margins deeply lobed or coarsely toothed or both [36]
35. Leaves 2 to 4 inches long Carolina moonseed (sarsaparilla) [229] 35. Leaves 4 to 10 inches long Canada moonseed (very rare) [230]
36. Leaf surfaces not downy or wooly [37] 36. At least lower leaf surfaces somewhat wooly grapes [266] and [267]
37. Leaves mostly 3-divided or deeply lobed or cut, fleshy cow-itch vine [264] 37. Leaves coarsely toothed, not divided or deeply lobed, grapelike except thin and smooth, or nearly smooth Cissus ampelopsis [265]
38. Leaves as broad as long sycamore [231] 38. Leaves not as broad as long [39]
39. Leaves toothed, not tough, rough above, not broader toward tip, often lobed on young trees red mulberry [227] 39. Leaves tough, not rough above, lobed or notched [40]
40. Leaves regularly notched but not deeply lobed [44] 40. Leaves deeply lobed or else broader toward tip, not regularly notched [41]
41. Lobes few and shallow or sharp-pointed at tips [42] 41. Lobes not sharp-pointed at tips [45]
42. Lobes, if any, few and shallow and near tip, leaves decidedly broader toward tip [43] 42. Leaves with several to many sharp-pointed lobes, some of them always fairly deep, variously shaped, (more than one species) red oaks [219]