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1 Leaves simple, sometimes shallowly or deeply 3-5 (-7)-lobed. |
..2 Tendrils not twining, terminating in adhesive disks; [tribe Parthenocisseae] |
..2 Tendrils twining, lacking adhesive disks. |
....3 Petals separate at their tips, falling individually; pith white, continuous through the node; bark adherent; tendrils bifid or trifid |
......4 Petals 5; stamens 5; upper leaf surfaces glabrous; [tribe Ampelopsideae] |
......4 Petals 4; stamens 4; upper leaf surfaces puberulent with upright, whitish-gray hairs; [tribe Cisseae] |
....3 Petals connate at their tips, falling together; pith tan to brown, interrupted by a diaphragm at each node ( Vitis) or continuous through the node ( Muscadinia); bark adherent ( Muscadinia) or exfoliating ( Vitis); tendrils bifid or trifid ( Vitis) or simple ( Muscadinia); [tribe Viteae]. |
........5 Tendrils simple; bark adherent (on all but the largest stems), with prominent lenticels; pith continuous through nodes; leaves relatively small (< 10 cm long and wide) and coarsely toothed, pentagonal in outline, but never deeply lobed |
........5 Tendrils bifid to trifid; bark shedding, the lenticels inconspicuous; pith interrupted by diaphragms at nodes; leaves relatively large (well-developed leaves usually > 10 cm wide and long) and finely toothed, often deeply lobed |
1 Leaves compound with either 3-5 (-7) or numerous leaflets. |
..........6 Leaves bipinnate to tripinnate, the leaflets on at least the better-developed leaves > 7; inflorescences axillary; [tribe Ampelopsideae] |
..........6 Leaves 3-7-foliolate; inflorescences axillary, leaf-opposed, or terminal. |
............ 7 Leaflets sessile; leaflets pinnately lobed; [tribe Ampelopsideae] |
............ 7 Leaflets petiolulate; leaflets toothed or entire. |
............ ..8 Leaves pedately 5-foliolate (the lateral 2 leaflets on either side borne on a common stalk, attached to one another above the summit of the petiole); [tribe Cayratieae] |
............ ..8 Leaves palmately 3-7-foliolate (the petiolules of all leaflets joined at the summit of the petiole). |
............ ....9 Inflorescences leaf-opposed or apparently terminal; leaves 3-7-foliolate; [tribe Parthenocisseae]. |
............ ....9 Inflorescences axillary or leaf-opposed; leaves 3-foliolate (even the largest and best-developed). |
............ ......10 Leaves fleshy, the blades > 1 mm thick when fresh; inflorescence axillary; [tribe Cayratieae] |
............ ......10 Leaves herbaceous, the blades thin; inflorescence leaf-opposed; [tribe Cisseae] |