| Lasthenia ambigua A. Gray, 1865 |
| Lasthenia californica DC. ex Lindl., 1835 |
| Lasthenia californica subsp. californica DC. ex Lindl., 1835 |
| Lasthenia chrysostoma (Fisch. & C.A. Mey.) Greene, 1894 |
| Lasthenia coronaria (Nutt.) Ornduff, 1966 |
| Lasthenia glabrata Lindl., 1835 |
| Lasthenia gracilis (DC.) Greene, 1894 |
| Lasthenia microglossa (DC.) Greene, 1894 |
| Launaea Cass., 1822 |
| Launaea intybacea (Jacq.) Beauverd, 1910 |
| Layia Hook. & Arn. ex DC., 1838 |
| Layia glandulosa (Hook.) Hook. & Arn., 1838 |
| Layia platyglossa A. Gray, 1849 |
| Layia platyglossa subsp. campestris D.D. Keck, 1958 |
| Lebetina Cass., 1822 |
| Lebetina cancellata Cass., 1822 |
| Lebetina porophylloides (A. Gray) A. Nelson, 1909 |
| Lebetina porophyllum (Cav.) Rydb., 1915 |
| Lebetina speciosa (A. Gray) A. Nelson, 1909 |
| Leibnitzia Cass., 1822 |