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Key to Vigna

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1 Corolla pink to purple; leaves herbaceous; [plant a cultivated introduction]; [section Catiang]
1 Corolla yellow; leaves somewhat fleshy-thickened; [plant native or introduced in maritime situations]; [section Vigna]
  2 Corolla 0.7-1.0 cm long; calyx tube 2 mm long; legumes 2-3 cm long, with 1-4 seeds in each; [uncommon non-native, s. FL]
  2 Corolla 1.5-1.7 cm long; calyx tube 4.5-6.0 mm long; legumes 4-7 cm long, with 5-12 seeds in each; [native, NC s. to FL, w. to s. TX]