Houstonia palmeri, the Saltillo bluet, is a plant species in the family Rubiaceae, native to the Mexican states of Coahuila and Nuevo León. Two varieties are recognized: Houstonia palmeri var. palmeri Houstonia palmeri var. muzquizana (B.L.Turner) Terrell References palmeri Endemic flora of Mexico Flora of Coahuila Flora of Nuevo León Plants described in 1882 Taxa named by Asa Gray