| Loxodon Cass., 1823 |
| Loxodon longipes Cass., 1823 |
| Loxothysanus B.L. Rob., 1907 |
| Loxothysanus filipes B.L. Rob., 1907 |
| Loxothysanus pedunculatus Rydb., 1914 |
| Loxothysanus sinuatus (Less.) B.L. Rob., 1907 |
| Lucilia Cass., 1817 |
| Lundellianthus H. Rob., 1978 |
| Lundellianthus breedlovei (B.L. Turner) Strother, 1989 |
| Lundellianthus guatemalensis (Donn. Sm.) Strother, 1989 |
| Lundellianthus jaliscensis (McVaugh) Strother, 1989 |
| Lundellianthus salvinii (Hemsl.) Strother, 1989 |
| Lygodesmia D. Don, 1829 |
| Lygodesmia exigua (A. Gray) A. Gray, 1874 |
| Lygodesmia ramosissima Greenm., 1900 |
| Lygodesmia texana (Torr. & A. Gray) Greene ex Small, 1903 |
| Machaeranthera Nees, 1832 |
| Machaeranthera arenaria (Benth.) Shinners, 1950 |
| Machaeranthera arida B.L. Turner & D.B. Horne, 1964 |
| Machaeranthera asteroides (Torr.) Greene, 1896 |