| Hoffmannia steyermarkii Standl., 1940 |
| Hoffmannia striata Rusby, 1920 |
| Hoffmannia strigillosa Hemsl., 1879 |
| Hoffmannia teruae L.O. Williams & Ant. Molina, 1973 |
| Hoffmannia tonduzii Standl., 1919 |
| Hoffmannia uniflora Standl., 1919 |
| Hoffmannia uxpanapense Cast.-Campos & Baut.-Bello, 2017 |
| Hoffmannia wilsonii Standl., 1940 |
| Houstonia L., 1753 |
| Houstonia acerosa (A. Gray) Benth. & Hook. f., 1873 |
| Houstonia acerosa subsp. tamaulipana (B.L. Turner) Borhidi, 2012 |
| Houstonia acerosa var. polypremoides (A. Gray) Terrell, 2001 |
| Houstonia angustifolia Michx., 1803 |
| Houstonia angustifolia var. scabra S. Watson, 1883 |
| Houstonia arenaria Rose, 1890 |
| Houstonia asperuloides (Benth.) A. Gray, 1860 |
| Houstonia australis I.M. Johnst., 1922 |
| Houstonia bouvardioides (Seem.) Benth. & Hook. f., 1873 |
| Houstonia brevipes Rose, 1890 |
| Houstonia coccinea Andr., 1800 |