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Key to Neptunia

Fabaceae

Neptunia

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1 Floating aquatic; stems inflated and spongy.
  2 Leaves lacking petiolar gland near the junction with the rachis (at lowest pair of pinnae); legume with 4-8 seeds
  2 Leaves with petiolar gland near the junction with the rachis (at lowest pair of pinnae); legume with 8-20 seeds
1 Terrestrial of upland dry to moist soils; stems wiry.
    3 Leaflets 9-18 pairs per pinna; stipules 2-4 mm long; all flowers perfect, with functional stamens; stipe of fruit 4-15 mm long
    3 Leaflets (12-) 15-40 (-43) pairs per pinna; stipules 4-10 mm long; flowers in the lower part of the inflorescence with flattened staminodes; stipe of fruit 2-5 mm long.
      4 Pinnae 2-3 (-4) pairs per leaf; legume 8-15 mm wide, < 2× as long as wide; [s. TX]
      4 Pinnae (2-) 3-5 pairs per leaf; legume 6-10 mm wide, > 2× as long as wide; [FL, GA, AL, MS, LA, and TX]