Taxonomy summary
Excluding species
Eukaryota
>
Viridiplantae
>
Streptophyta
>
Magnoliopsida
>
Gentianales
>
Rubiaceae
>
Houstonia
Houstonia acerosa
Houstonia caerulea
Houstonia canadensis
Houstonia correllii
Houstonia croftiae
Houstonia humifusa
Houstonia longifolia
Houstonia micrantha
Houstonia ouachitana
Houstonia palmeri
Houstonia parviflora
Houstonia procumbens
Houstonia purpurea
Houstonia pusilla
Houstonia rosea
Houstonia rubra
Houstonia serpyllifolia
Houstonia spellenbergii
Houstonia subviscosa
Houstonia teretifolia
Houstonia wrightii
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