Houstonia acerosa- Houstonia asperuloidis
- Houstonia caerulea
- Houstonia canadensis
- Houstonia correllii
- Houstonia croftiae
- Houstonia fruticosa
- Houstonia gracillima
- Houstonia humifusa
- Houstonia longifolia
- Houstonia micrantha
- Houstonia ouachitana
- Houstonia palmeri
- Houstonia parviflora
- Houstonia polypremnoides
- Houstonia procumbens
- Houstonia prostrata
- Houstonia purpurea
- Houstonia pusilla
- Houstonia rosea
- Houstonia rubra
- Houstonia serpyllifolia
- Houstonia sharpii
- Houstonia spellenbergii
- Houstonia subviscosa
- Houstonia wrightii