World flora Plants of the world floraExplore

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• Genera
• Species 8

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Houstonia caerulea L.

Azure bluet

475 443 Observations

Rubiaceae

Houstonia longifolia Gaertn.

Longleaf summer bluet

43 41 Observations

Rubiaceae

Houstonia micrantha (Shinners) Terrell

Southern bluet

38 35 Observations

Rubiaceae

Houstonia purpurea L.

Large summer bluet

109 86 Observations

Rubiaceae

Houstonia pusilla Schoepf

Tiny Bluet

246 229 Observations

Rubiaceae

Houstonia rosea (Raf.) Terrell

Rose bluet

10 5 Observations

Rubiaceae

Houstonia rubra Cav.

Red bluet

18 18 Observations

Rubiaceae

Houstonia serpyllifolia Michx.

Thyme-Leaf Bluet

38 35 Observations

Rubiaceae

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