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..2 Stems trailing; leaflets 1-4 cm long, strongly 3-lobed, suborbicular; leaflet surfaces strongly reticulate-veined; [longleaf pine sandhill habitats, NC to FL west to MS]
....3 Leaflets unlobed; vines climbing; [widespread]
....3 Leaflets 3-lobed; vines trailing or climbing; [restricted to n. FL southward]
......4 Corolla 1.5-2 cm long, scarlet red or bright lavender; racemes exserted; plants twining; [section Coccinei]
........5 Legumes distinctly flattened at maturity, 15-20 mm wide; corolla usually greenish white; [section Paniculati; subsection Volubili]
........5 Legumes nearly terete at maturity, about 8 mm in diameter; corolla usually pink-purple, at least in part; [section Phaseoli]