Synonyms: Dipteracanthus ciliosus (homotypic); Dipteracanthus ciliosus var. hybridus; Dipteracanthus ciliosus var. parviflorus; Dipteracanthus drummondii; Dipteracanthus mitchellianus; Dipteracanthus noctiflorus (homotypic); Hygrophila oblongifolia (heterotypic); Pattersonia caroliniensis (homotypic); Ruellia caroliniensis dentata; Ruellia caroliniensis var. cheloniformis; Ruellia caroliniensis var. membranacea; Ruellia caroliniensis var. nanella; Ruellia caroliniensis var. parviflora; Ruellia caroliniensis var. salicina; Ruellia caroliniensis var. semicalva; Ruellia ciliosa var. hybrida; Ruellia ciliosa var. parviflora; Ruellia hirsuta (heterotypic); Ruellia hybrida; Ruellia longiflora (heterotypic); Ruellia oblongifolia (heterotypic); Ruellia parviflora (heterotypic); Ruellia strepens (heterotypic); Ruellia triflora (heterotypic)