• Ruellia Cossmann, 1913 † [Family: Veneroida (awaiting allocation)]
• Ruellia Linnaeus, 1753 [Family: Acanthaceae]
• Ruellia alopecuroidea Vahl accepted as Teliostachya alopecuroidea (Vahl) Nees
• Ruellia alopecuroides Vahl accepted as Teliostachya alopecuroidea (Vahl) Nees
• Ruellia antipoda Linnaeus accepted as Lindernia antipoda (L.) Alston
• Ruellia blechum Linnaeus accepted as Blechum pyramidatum (Lam.) Urban
• Ruellia brasiliensis Spreng. accepted as Hygrophila costata Nees
• Ruellia brevifolia (Pohl) Ezcurra
• Ruellia brittoniana Leonard
• Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia chartacea (T. Anders.) Wasshausen
• Ruellia ciliatiflora Hook.
• Ruellia ciliosa Pursh accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia coccinea (L.) Vahl
• Ruellia corzoi Tharp & Barkl.
• Ruellia davisiorum Tharp & Barkl.
• Ruellia devosiana hort. Makoy ex E. Murr.
• Ruellia drummondiana (Nees) Gray
• Ruellia drushelii Tharp & Barkl.
• Ruellia dulcis Cav. accepted as Stenandrium dulce (Cav.) Nees
• Ruellia fulgida Andrews
• Ruellia graecizans Backer accepted as Ruellia brevifolia (Pohl) Ezcurra
• Ruellia heteromorpha Fern. accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia humilis Nutt.
• Ruellia humilis sensu Small, non Nutt. accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia humistrata Michx. accepted as Dyschoriste humistrata (Michx.) Kuntze
• Ruellia hybrida Pursh accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia hybrida sensu Small, non Pursh accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia lacustris Schlecht. & Cham. accepted as Hygrophila lacustris (Schlecht. & Cham.) Nees
• Ruellia lorentziana Griseb. accepted as Ruellia ciliatiflora Hook.
• Ruellia malacosperma Greenm.
• Ruellia malacosperma sensu Small, non Greenm. accepted as Ruellia brittoniana Leonard
• Ruellia metziae Tharp
• Ruellia muelleri Tharp & Barkl. accepted as Ruellia metziae Tharp
• Ruellia noctiflora (Nees) Gray
• Ruellia nudiflora (Engelm. & Gray) Urban
• Ruellia oblongifolia Michx. accepted as Dyschoriste oblongifolia (Michx.) Kuntze
• Ruellia occidentalis (Gray) Tharp & Barkl.
• Ruellia parryi Gray
• Ruellia parviflora (Nees) Britt. accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia pedunculata Torr. ex Gray
• Ruellia picta Loddiges accepted as Ruellia nudiflora (Engelm. & Gray) Urban
• Ruellia pinetorum Fern. accepted as Ruellia pedunculata Torr. ex Gray
• Ruellia prostrata Poir.
• Ruellia purshiana Fern.
• Ruellia reptans Forst. f. accepted as Hemigraphis reptans (G. Forst.) T. Anders. ex Hemsl.
• Ruellia runyonii Tharp & Barkl. accepted as Ruellia nudiflora (Engelm. & Gray) Urban
• Ruellia strepens Linnaeus
• Ruellia strictopaniculata Tharp & Barkl. accepted as Ruellia occidentalis (Gray) Tharp & Barkl.
• Ruellia succulenta Small accepted as Ruellia caroliniensis (J.F. Gmel.) Steud.
• Ruellia tuberosa Linnaeus
• Ruellia tuberosa sensu Gray accepted as Ruellia nudiflora (Engelm. & Gray) Urban
• Ruellia tweediana auct. non Griseb. accepted as Ruellia brittoniana Leonard
• Ruellia yucatana (Leonard) Tharp & Barkl.