| Lapsana communis L., 1753 |
| Lasallea Greene, 1903 |
| Lasallea oblongifolia (Nutt.) Semple & Brouillet, 1980 |
| Lasianthaea DC., 1836 |
| Lasianthaea aurea (D. Don) K.M. Becker, 1979 |
| Lasianthaea beckeri B.L. Turner, 1988 |
| Lasianthaea breedlovei B.L. Turner, 1988 |
| Lasianthaea calva (Greenm.) B.L. Turner, 1988 |
| Lasianthaea ceanothifolia (Willd.) K.M. Becker, 1979 |
| Lasianthaea ceanothifolia var. ceanothifolia (Willd.) K.M. Becker, 1979 |
| Lasianthaea ceanothifolia var. gracilis (W.W. Jones) K.M. Becker, 1979 |
| Lasianthaea ceanothifolia var. gradata (S.F. Blake) K.M. Becker, 1979 |
| Lasianthaea ceanothifolia var. verbenifolia (DC.) K.M. Becker, 1979 |
| Lasianthaea crocea (A. Gray) K.M. Becker, 1979 |
| Lasianthaea fruticosa (L.) K.M. Becker, 1975 |
| Lasianthaea fruticosa var. aggregata (S.F. Blake) K.M. Becker, 1979 |
| Lasianthaea fruticosa var. alamosana K.M. Becker, 1979 |
| Lasianthaea fruticosa var. fasciculata (DC.) K.M. Becker, 1979 |
| Lasianthaea fruticosa var. fruticosa (L.) K.M. Becker, 1975 |
| Lasianthaea fruticosa var. michoacana (S.F. Blake) K.M. Becker, 1979 |