| Krynitzkia Fisch. & C.A. Mey., 1841 |
| Krynitzkia angustifolia (Torr.) A. Gray, 1885 |
| Krynitzkia denticulata Greene, 1885 |
| Krynitzkia foliosa Greene, 1885 |
| Krynitzkia grayi Vasey & Rose, 1888 |
| Krynitzkia heliotropioides (A. DC.) A. Gray, 1885 |
| Krynitzkia maritima Greene, 1885 |
| Krynitzkia mexicana Brandegee, 1905 |
| Krynitzkia palmeri A. Gray, 1885 |
| Krynitzkia peninsularis Rose, 1890 |
| Krynitzkia pusilla (Torr. & A. Gray) A. Gray, 1885 |
| Krynitzkia ramosa A. Gray, 1885 |
| Lappula Moench, 1794 |
| Lappula collina Greene, 1899 |
| Lappula costaricensis Brand, 1922 |
| Lappula desertorum Greene, 1899 |
| Lappula guatemalensis Brand, 1922 |
| Lappula heliocarpa Brand, 1922 |
| Lappula mexicana (Schltdl. & Cham.) Greene, 1891 |
| Lappula occidentalis (S. Watson) Greene, 1899 |