All Species in Houstonia
- Azure Bluet (Houstonia caerulea)
- Canadian Summer Bluet (Houstonia canadensis)
- Correll's Bluet (Houstonia correllii)
- Croft's Bluet (Houstonia croftiae)
- Greenman's Bluet (Houstonia parviflora)
- Houstonia acerosa var. acerosa (Houstonia acerosa var. acerosa)
- Houstonia acerosa var. polypremoides (Houstonia acerosa var. polypremoides)
- Houstonia acerosa var. tamaulipana (Houstonia acerosa var. tamaulipana)
- Houstonia longifolia var. compacta (Houstonia longifolia var. compacta)
- Houstonia longifolia var. longifolia (Houstonia longifolia var. longifolia)
- Houstonia longifolia var. tenuifolia (Houstonia longifolia var. tenuifolia)
- Houstonia macvaughii (Houstonia macvaughii)
- Houstonia palmeri (Houstonia palmeri)
- Houstonia palmeri var. muzquizana (Houstonia palmeri var. muzquizana)
- Houstonia palmeri var. palmeri (Houstonia palmeri var. palmeri)
- Houstonia purpurea var. calycosa (Houstonia purpurea var. calycosa)
- Houstonia purpurea var. montana (Houstonia purpurea var. montana)
- Houstonia purpurea var. purpurea (Houstonia purpurea var. purpurea)
- Houstonia sharpii (Houstonia sharpii)
- Houstonia spellenbergii (Houstonia spellenbergii)
- Houstonia teretifolia (Houstonia teretifolia)
- Longleaf Summer Bluet (Houstonia longifolia)
- Matted Bluet (Houstonia humifusa)
- Needleleaf Bluet (Houstonia acerosa)
- New Mexico Starviolet (Houstonia prostrata)
- Nodding Bluet (Houstonia subviscosa)
- Ouachita Bluet (Houstonia ouachitana)
- Pygmy Bluet (Houstonia wrightii)
- Red Bluet (Houstonia rubra)
- Rose Bluet (Houstonia rosea)
- Roundleaf Bluet (Houstonia procumbens)
- Southern Bluet (Houstonia micrantha)
- Thymeleaf Bluet (Houstonia serpyllifolia)
- Tiny Bluet (Houstonia pusilla)
- Venus' Pride (Houstonia purpurea)