| Inuleae Cass., 1819 |
| Inulinae Dumort., 1827 |
| Iostephane Benth., 1873 |
| Iostephane heterophylla (Cav.) Benth. ex Hemsl., 1881 |
| Iostephane madrensis (S. Watson) Strother, 1983 |
| Iostephane papposa J.J. Fay, 1973 |
| Iostephane trilobata Hemsl., 1881 |
| Isocarpha R. Br., 1817 |
| Isocarpha alternifolia Cass., 1822 |
| Isocarpha atriplicifolia (L.) R. Br. ex DC., 1836 |
| Isocarpha atriplicifolia var. atriplicifolia (L.) R. Br. ex DC., 1836 |
| Isocarpha atriplicifolia var. billbergiana (Less.) D.J. Keil & Stuessy, 1981 |
| Isocarpha billbergiana Less., 1831 |
| Isocarpha echioides Less., 1830 |
| Isocarpha oppositifolia (L.) R. Br., 1817 |
| Isocarpha oppositifolia var. achyranthes (DC.) D.J. Keil & Stuessy, 1981 |
| Isocarpha oppositifolia var. oppositifolia (L.) R. Br., 1817 |
| Isocarpha tricephala Cass., 1823 |
| Isocoma Nutt., 1840 |
| Isocoma acradenia (Greene) Greene, 1894 |