Houstonia spellenbergii is a plant species in the family Rubiaceae.Terrell, Edward Everett. 1991. Phytologia 71(3): 234, Houstonia spellenbergii Nesom, Guy L. & Vorobik, Linda A. 1988. Systematic Botany 13(3): 432–434, f. 1, Hedyotis spellenbergii It is native to the western part of the state of Chihuahua in northern Mexico, at an elevation of approximately 2100 m in the Sierra Madre Occidental near the Basaseáchic waterfall.Kew World Checklist of Selected Plant FamiliesTropicos
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