''Houstonia correllii'', the Zapata County bluet, or Correll's bluet, is a species of plants in the

Rubiaceae The Rubiaceae are a family of flowering plants, commonly known as the coffee, madder, or bedstraw family. It consists of terrestrial trees, shrubs, lianas, or herbs that are recognizable by simple, opposite leaves with interpetiolar stipules ...

. It is known only from Zapata County in southern

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

. It is a prostrate, mat-forming plant with white flowers.Biota of North America Program
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Photo of herbarium specimen at Missouri Botanical Garden, Donovan S. Correll - 32250 , collected in Texas, ''Houstonia correllii''
correllii Endemic flora of Texas Zapata County, Texas Plants described in 1975 Flora without expected TNC conservation status {{Rubioideae-stub