Houstonia croftiae, the South Texas bluet or Croft's bluet, is a species of plants in the family Rubiaceae.Britton, Nathaniel Lord & Rusby, Henry Hurd. 1887. Transactions of the New York Academy of Sciences 7: 10Shinners, Lloyd Herbert. 1949. Field & Laboratory 17(4): 167, Hedyotis croftiae It is known only from 9 counties in southern Texas: Hidalgo, Starr, Zapata, Webb, La Salle, Duval, Jim Wells, Refugio and San Patricio).Biota of North America Program
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