PlantsFlowering PlantsBluebells & relatives — Family Campanulaceae
Leaves alternate, simple. Stamens 5.
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Bellflower — Genus Campanula
Pale Lobelia
Lobelia — Genus Lobelia
Venus' Looking-glass — Genus Triodanis
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Southern Rockbell —  Wahlenbergia marginata [1]
Evidence that species is found in Texas:
  1. USDA Plants Database, advanced search for Texas plants from the United States Department of Agriculture.