| Lobelia hartwegii var. angusta E. Wimm., 1948 |
| Lobelia henricksonii M.C. Johnst., 1982 |
| Lobelia hintoniorum B.L. Turner, 1996 |
| Lobelia hypnodes E. Wimm. ex McVaugh, 1940 |
| Lobelia illota McVaugh, 1940 |
| Lobelia irasuensis Planch. & Oerst., 1858 |
| Lobelia irasuensis subsp. fucata (McVaugh) Lammers, 2006 |
| Lobelia irasuensis subsp. picta (B.L. Rob. & Seaton) Lammers, 2006 |
| Lobelia jaliscensis McVaugh, 1940 |
| Lobelia knoblochii T.J. Ayers, 1987 |
| Lobelia laxiflora Kunth, 1819 |
| Lobelia laxiflora f. lutea Standl. & Steyerm., 1944 |
| Lobelia laxiflora subsp. angustifolia (A. DC.) Eakes & Lammers, 1999 |
| Lobelia laxiflora subsp. laxiflora Kunth, 1819 |
| Lobelia laxiflora var. angustifolia A. DC., 1839 |
| Lobelia laxiflora var. laxiflora Kunth, 1819 |
| Lobelia laxiflora var. nelsonii (Fernald) McVaugh, 1940 |
| Lobelia laxiflora var. patula (Planch. & Oerst.) E. Wimm., 1953 |
| Lobelia laxiflora var. stricta (Planch. & Oerst.) McVaugh, 1943 |
| Lobelia lithophila Senterre & Cast.-Campos, 2008 |