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1 Leaves 1-foliolate; petioles conspicuously winged
..2 Leaflets 5-7-foliolate; [rare alien]
......4 Lower calyx lobe 5-8 mm long, subulate to lanceolate; upper (bifurcate) calyx lobe 3-4 mm long; bracteoles 5-7 mm long; stems to 3 m long; [of n. FL southward]
........5 Terminal leaflets > 8× as long as wide; main lateral veins of terminal leaflets 10-20+; [s. GA, s. AL, south to s. FL]
........5 Terminal leaflets < 6× as long as wide; main lateral veins of terminal leaflets 5-7; [widespread in our area, south to s. FL]
..........6 Leaflets 3.0-4.5× as long as wide, obtuse at the tip; calyx tube of chasmogamous flowers 7-10 mm long, usually purplish; legume on a stipe 15-20 mm long, well exserted from the calyx; erect or ascending herb, 2-6 dm tall; [peninsular FL]
..........6 Leaflets 1.7-3.5× as long as wide, slightly acute at the tip; calyx tube of chasmogamous flowers 10-13 mm long, green; legume on a stipe 10-15 mm long, included or slightly exserted from the calyx; ascending herb, becoming a sprawling, trailing, or twining herbaceous vine; [collectively widespread in our area].
............ 7 Leaves glabrescent beneath, at maturity the hairs confined or very nearly so to the major veins; [widespread in our area]
............ 7 Leaves moderately to densely pubescent beneath, the hairs erect and pilose to suberect and sericeous, at maturity occurring across the leaf surface; [endemic to FL peninsula]