| Lessingia germanorum Cham., 1829 |
| Lessingia germanorum var. glandulifera (A. Gray) J.T. Howell, 1929 |
| Lessingia glandulifera A. Gray, 1882 |
| Leucactinia Rydb., 1915 |
| Leucactinia bracteata (S. Watson) Rydb., 1915 |
| Leucantheminae Bremer & Humphries, 1993 |
| Leucanthemum Mill., 1754 |
| Leucanthemum lacustre (Brot.) Samp., 1913 |
| Leucanthemum maximum (Ramond) DC., 1838 |
| Leucanthemum vulgare Lam., 1778 |
| Leuciva Rydb., 1922 |
| Leuciva dealbata (A. Gray) Rydb., 1922 |
| 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 |