| Neltuma yaquiana (R.A. Palacios) C.E. Hughes & G.P. Lewis, 2022 |
| Neomimosa Britton & Rose, 1928 |
| Neomimosa colimensis (B.L. Rob.) Britton & Rose, 1928 |
| Neomimosa donnell-smithii Britton & Rose, 1928 |
| Neomimosa eurycarpoides (B.L. Rob.) Britton & Rose, 1928 |
| Neomimosa russellii Britton & Rose, 1928 |
| Nephromeria (Benth.) Schindl., 1924 |
| Nephromeria macrodesma (S.F. Blake) Schindl., 1928 |
| Neptunia Lour., 1790 |
| Neptunia natans W. Theob., 1883 |
| Neptunia oleracea Lour., 1790 |
| Neptunia palmeri Britton & Rose, 1928 |
| Neptunia plena (L.) Benth., 1841 |
| Neptunia pubescens Benth., 1841 |
| Neptunia pubescens var. microcarpa (Rose) Windler, 1966 |
| Neptunia pubescens var. pubescens Benth., 1841 |
| Neustanthus Benth., 1852 |
| Neustanthus phaseoloides (Roxb.) Benth., 1852 |
| Nicarago Britton & Rose, 1930 |
| Nicarago vesicaria (L.) Britton & Rose, 1930 |