| Indigofera sphinctosperma Standl., 1919 |
| Indigofera spicata Forssk., 1775 |
| Indigofera suffruticosa Mill., 1768 |
| Indigofera texana Buckley, 1862 |
| Indigofera thibaudiana DC., 1825 |
| Indigofera tinctoria L., 1753 |
| Indigofera tinctoria var. brachycarpa DC., 1825 |
| Indigofera torulosa Hook. & Arn., 1838 |
| Indigofera trita L. f., 1782 |
| Indigofera trita subsp. scabra (Roth) de Kort & G. Thijsse, 1984 |
| Indigofera truxillensis Kunth, 1824 |
| Indigofera tumidula Rose, 1909 |
| Indigofera uniseminalis Rzed. & R. Grether, 2018 |
| Indigofera volubilis Wendland ex J.C. Wendl., 1798 |
| Indigofera zacuapana Rydb., 1923 |
| Indigofereae Benth., 1859 |
| Inflati A. Gray, 1864 |
| Inga Mill., 1754 |
| Inga acrocephala Steud., 1843 |
| Inga aestuariorum Pittier, 1916 |