Houstonia teretifolia is a plant species in the family Rubiaceae, endemic to the Mexican state of Coahuila.Kew World Checklist of Selected Plant FamiliesTerrell, Edward E. 1979. New species and combinations in Houstonia (Rubiaceae). Brittonia 31:164-169
Houstonia teretifolia is distinguished by other species in the genus by having leaves that are terete, i.e., long and narrow, round in cross-section.
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