Taxa Count: 21

RUBIACEAE

Houstonia acerosa

Houstonia caerulea

Houstonia caerulea var. faxonorum

Houstonia longifolia

Houstonia longifolia var. tenuifolia

Houstonia micrantha

Houstonia minima

Houstonia ouachitana

Houstonia patens

Houstonia procumbens

Houstonia purpurea

Houstonia purpurea var. calycosa

Houstonia purpurea var. montana

Houstonia purpurea var. purpurea

Houstonia pusilla

Houstonia rosea

Houstonia rupicola

Houstonia serpyllifolia

Houstonia tenuifolia

Houstonia wrightii