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Key G2: woody plants with alternate, simple, palmately lobed leaves

Plantae

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1 Lianas (or rarely hemiepiphytic climbers, not free-standing).
  2 Plants hemiepiphytic climbers; the simple (juvenille) leaves with strong hastate basal lobes (mature leaves pedately 5-lobed); [uncommon non-natives, FL]
  2 Plants lianas; the leaves variously shaped, but lacking strong hastate basal lobing (and never pedately 5-lobed); [natives and non-natives, collectively widespread, including FL].
        5 Tendrils branched, leaf-opposed; leaves mostly 5-7-lobed, the margins also serrate or dentate
        5 Tendrils simple (though paired in Smilax in SMILACACEAE), axillary; leaves 3-lobed, the margins entire, serrulate, or prickly.
          6 Leaves longer than wide, entire or prickly-margined; stems usually obviously armed with prickles; flowers 6-merous, greenish, in umbels borne in leaf axils; tendrils stipular, 2 per leaf axil, adnate to the petiole basally
          6 Leaves wider than long, entire or serrulate; stems not armed; flowers 5-merous, blue-purple or yellow, solitary or in small fascicles in leaf axils; tendrils 1 per leaf axil
1 Trees or shrubs (plants free standing).
               8 Leaves > 3 dm long and wide; tree monopodial, with a single, unbranched stem (rarely with a few branches).
                 9 Leaf lobes > 15, not sublobed; venation of each lobe parallel; fruit a drupe, with 1 seed; [Monocots]
                 9 Leaf lobes < 13, most of these sublobed (except Kalopanax); venation of each lobe pinnate; fruit either a many-seeded berry or a single-seeded nutlet (if a drupe, as in Kalopanax, then the leaf lobe venation pinnate and plants often armed with stout prickles); [Eudicots].
                   10 Plants often armed with stout prickles (leaves and stems); leaves usually with 5-7 lobes; inflorescences complex, grouped into a panicle of terminal umbels
                   10 Plants unarmed; leaves with 5-10+ lobes; inflorescences paniculate, the terminal branches never consisting of umbels.
                     11 Petiole attachment marginal, the base lacking a prominent pulvinus; leaf lobes mostly sublobed; fruit a large berry, with many seeds
                     11 Petiole attachment peltate, the base of the petiole usually with a prominent area of swollen tissue (pulvinus); leaf lobes not sublobed; fruit a nutlet, single-seeded
               8 Leaves < 3 dm long and wide; tree branching; [Eudicots].
                       12 Leaves 2-lobed (deeply notched at the apex), each lobe separated by the midvein, asymmetrical; [peninsular FL and s. TX]
                       12 Leaves 3-5 (-7) lobed; [collectively widespread].
                          13 Leaf blades (3-) 5 (-7) lobed, to 15 cm wide and long, each lobe finely serrate-crenate (>3 teeth per cm of margin) and rarely with a small sub-lobe; multiple fruit spherical and spiky, consisting of multiple bird-beak-like loculicidal capsules; buds axillary
                          13 Leaves 3 (-5)-lobed, to 35 cm wide and long, each lobe coarsely toothed or sublobed, the teeth or sublobes (at most 1-2 per cm of margin) attenuate-acuminate; multiple fruit spherical and merely rough on the surface, consisting of multiple achenes with tawny bristles; buds infrapetiolar (completely hidden in the swollen petiole base)
                                  17 Inflorescence a panicle of umbels, the flowers white or cream-colored; stipules fused and sheathing, but leaving a U-shaped scar (not conspicuously circular around the stem)
                                  17 Inflorescence paniculate, with female flowers above (distal), the flowers reddish-green colored (the male flowers with a yellowish color but overall the inflorescence not notably white or cream-colored; stipules deciduous, but leaving a circular scar around the stem nodes
                                16 Leaves pubescent, slightly or strongly so; [natives and non-natives].
                                       19 Leaves 10-30 cm long and wide; fruit a berry; inflorescence of solitary to a few flowers, or a raceme