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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to 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 9-15 pairs per pinna; stipules 2-4 mm long; all flowers perfect, with functional stamens; stipe of fruit 4-15 mm long
....3 Leaflets (12-) 15-25 (-35) 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]