| Leucopsidium Charpent. ex DC., 1838 |
| Leucopsidium humile Benth., 1839 |
| Leucosyris Greene, 1897 |
| Leucosyris arida (B.L. Turner & D.B. Horne) Pruski & R.L. Hartm., 2012 |
| Leucosyris blepharophylla (A. Gray) Pruski & R.L. Hartm., 2012 |
| Leucosyris carnosa (A. Gray) Greene, 1897 |
| Leucosyris carnosa var. intricata (A. Gray) Cronquist, 1994 |
| Leucosyris coulteri (A. Gray) Pruski & R.L. Hartm., 2012 |
| Leucosyris crispa (Brandegee) Pruski & R.L. Hartm., 2012 |
| Leucosyris parviflora (A. Gray) Pruski & R.L. Hartm., 2012 |
| Leucosyris riparia (Kunth) Pruski & R.L. Hartm., 2012 |
| Leucosyris spinosa (Benth.) Greene, 1897 |
| Leucosyris turneri (M.L. Arnold & R.C. Jacks.) Pruski & R.L. Hartm., 2012 |
| Liabeae Rydb., 1927 |
| Liabellum Rydb., 1927 |
| Liabellum angustissimum (A. Gray) Rydb., 1927 |
| Liabellum cervinum (B.L. Rob.) Rydb., 1927 |
| Liabellum gentryi H. Rob., 1978 |
| Liabellum hintoniorum (B.L. Turner) H. Rob., 1990 |
| Liabellum palmeri (A. Gray) Rydb., 1927 |