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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]
..2 Stems climbing and twining on other vegetation (or trailing); leaflets 3-10 cm long, 3-lobed or not, ovate; leaflet surfaces only slightly reticulate; [various habitats; collectively widespread
......4 Corolla ca. 1 cm long, pink-purple, greenish white, or bicolored pink and white; racemes short or exserted; plants bushy-erect (rarely twining).
........5 Legumes distinctly flattened at maturity, 15-20 mm wide; corolla usually greenish white; [section Paniculati; subsection Volubili]