| Lobelia longicaulis Brandegee, 1914 |
| Lobelia longicaulis var. plebeia (E. Wimm.) E. Wimm., 1953 |
| Lobelia longiflora L., 1753 |
| Lobelia longifolia (C. Presl) A. DC., 1839 |
| Lobelia loretensis M.E. Jones, 1933 |
| Lobelia macdonaldii B.L. Turner, 1992 |
| Lobelia macrocentron (Benth.) T.J. Ayers, 1987 |
| Lobelia margarita E. Wimm., 1948 |
| Lobelia mcvaughii T.J. Ayers, 1987 |
| Lobelia mexicana E. Wimm., 1948 |
| Lobelia micrantha Kunth, 1819 |
| Lobelia mollis Graham, 1829 |
| Lobelia monticola Kunth, 1819 |
| Lobelia mucronata Engelm., 1848 |
| Lobelia nana Kunth, 1819 |
| Lobelia neglecta Vatke, 1874 |
| Lobelia nelsonii Fernald, 1901 |
| Lobelia novella B.L. Rob., 1891 |
| Lobelia oaxacana Rzed., 2016 |
| Lobelia obconica E. Wimm., 1948 |