| Solanum leptosepalum Correll, 1952 |
| Solanum lignescens Fernald, 1897 |
| Solanum longiconicum Bitter, 1912 |
| Solanum longipedicellatum Bitter, 1912 |
| Solanum longipedicellatum var. longimucronatum Hawkes, 1944 |
| Solanum longipedicellatum var. pseudoprophyllum Bitter, 1912 |
| Solanum longistylum Correll, 1952 |
| Solanum lucidum M. Martens & Galeotti, 1845 |
| Solanum luteo-virescens Dunal, 1852 |
| Solanum macrantherum Dunal, 1816 |
| Solanum macranthum Dunal, 1814 |
| Solanum macropilosum Correll, 1961 |
| Solanum macroscolum Fernald, 1900 |
| Solanum madrense Fernald, 1900 |
| Solanum malinchense Hawkes, 1944 |
| Solanum mammosissimum Ramírez, 1911 |
| Solanum manicatum Bitter, 1913 |
| Solanum manoteranthum Bitter, 1912 |
| Solanum martensii Dunal, 1852 |
| Solanum matehualae Hjert. & T. R. Tarn, 1988 |