| Kosteletzkya paniculata Benth., 1849 |
| Kosteletzkya pentasperma (Bertero ex DC.) Griseb., 1859 |
| Kosteletzkya ramosa Fryxell, 1977 |
| Kosteletzkya reclinata Fryxell, 1977 |
| Kosteletzkya sagittata C. Presl, 1835 |
| Kosteletzkya stellata Fernald, 1895 |
| Kosteletzkya tampicensis (Moric. ex Ser.) Rose, 1905 |
| Kosteletzkya thurberi A. Gray, 1887 |
| Kosteletzkya tubiflora (DC.) O.J. Blanch. & McVaugh, 1978 |
| Kosteletzkya violacea Rose, 1905 |
| Krapovickasia Fryxell, 1978 |
| Krapovickasia physaloides (C. Presl) Fryxell, 1978 |
| Lavatera L., 1753 |
| Lavatera arborea L., 1753 |
| Lavatera assurgentiflora Kellogg, 1854 |
| Lavatera lindsayi Moran, 1951 |
| Lavatera occidentalis S. Watson, 1875 |
| Lavatera venosa S. Watson, 1877 |
| Lexarza La Llave & Lex., 1825 |
| Lexarza funebris La Llave, 1825 |