Houstonia correllii, the Zapata County bluet, or Correll's bluet, is a species of plants in the Rubiaceae.Terrell, Edward Everett. 1975. Phytologia 31(6): 425. Houstonia correlliiLewis, Walter Hepworth. 1972. Brittonia 24(4): 395–397, f. 1–2. Hedyotis correllii It is known only from Zapata County in southern Texas. It is a prostrate, mat-forming plant with white flowers.Biota of North America Program
References
External links Photo of herbarium specimen at Missouri Botanical Garden, Donovan S. Correll - 32250 , collected in Texas, Houstonia correllii