| Horsfordia exalata Fryxell, 1985 |
| Horsfordia newberryi (S. Watson) A. Gray, 1887 |
| Horsfordia rotundifolia S. Watson, 1889 |
| Kearnemalvastrum D.M. Bates, 1967 |
| Kearnemalvastrum lacteum (Aiton) D.M. Bates, 1967 |
| Kearnemalvastrum subtriflorum (Lag.) D.M. Bates, 1967 |
| Ketmia Mill., 1754 |
| Ketmia arborea Moench, 1794 |
| Ketmia syriaca (L.) Scop., 1772 |
| Ketmia syrorum Medik., 1787 |
| Kosteletzkya C. Presl, 1835 |
| Kosteletzkya blanchardii Fryxell, 1977 |
| Kosteletzkya bracteosa M.E. Jones, 1929 |
| Kosteletzkya cordata C. Presl, 1835 |
| Kosteletzkya depressa (L.) O.J. Blanch., Fryxell & D.M. Bates, 1978 |
| Kosteletzkya flavicentrum Fryxell & S.D. Koch, 1987 |
| Kosteletzkya hastata C. Presl, 1835 |
| Kosteletzkya hibiscifolia Standl.,1936 |
| Kosteletzkya hispida C. Presl, 1835 |
| Kosteletzkya hispidula (Spreng.) Garcke, 1853 |