| Heterotoma arabidoides (Hook. & Arn.) Benth. & Hook. f. ex Hemsl., 1881 |
| Heterotoma aurita Brandegee, 1891 |
| Heterotoma cordifolia (Hook. & Arn.) McVaugh, 1940 |
| Heterotoma endlichii E. Wimm., 1929 |
| Heterotoma flexuosa (C. Presl) McVaugh, 1940 |
| Heterotoma gibbosa S. Watson, 1888 |
| Heterotoma goldmanii Fernald, 1901 |
| Heterotoma lobelioides Zucc., 1832 |
| Heterotoma lobelioides subsp. glabra (T.J. Ayers) Lammers, 2006 |
| Heterotoma lobelioides subsp. lobelioides Zucc., 1832 |
| Heterotoma macrocentron Benth., 1876 |
| Heterotoma salvadorensis E. Wimm., 1948 |
| Heterotoma stenodonta Fernald, 1901 |
| Heterotoma tenella M. Martens & Galeotti ex Benth. & Hook. f., 1873 |
| Hippobroma G. Don, 1834 |
| Hippobroma longiflora (L.) G. Don, 1834 |
| Homochilus A. DC., 1839 |
| Isotoma (R. Br.) Lindl., 1826 |
| Isotoma longiflora (L.) C. Presl, 1836 |
| Laurentia Adans., 1763 |