| Anotis ciliolosa G.Don (synonym) |
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| Anotis lanceolata DC. (synonym) |
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| Anotis longifolia G.Don (synonym) |
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| Diodia frankii Steud. & Hochst. ex C.Presl (synonym) |
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| Hedyotis caroliniana Raeusch. (synonym) |
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| Hedyotis ciliolata Torr. ex Spreng. (synonym) |
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| Hedyotis frankii C.Presl (synonym) |
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| Hedyotis purpurea forma albiflora (Standl.) Fosberg (synonym) |
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| Hedyotis purpurea forma leucantha (Standl.) Fosberg (synonym) |
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| Hedyotis purpurea forma pubescens (Britton) Fosberg (synonym) |
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| Hedyotis umbellata Walter (synonym) |
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| Houstonia angustifolia Pursh (synonym) |
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| Houstonia angustifolia var. rigidiuscula A.Gray (synonym) |
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| Houstonia lanceolata forma albiflora Standl. (synonym) |
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| Houstonia macrosepala Nutt. ex Torr. & A.Gray (synonym) |
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| Houstonia pubescens Raf. (synonym) |
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| Houstonia purpurea forma pubescens (Britton) Fernald (synonym) |
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| Houstonia purpurea var. pubescens Britton (synonym) |
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| Houstonia rigidiuscula (A.Gray) Wooton & Standl. (synonym) |
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| Houstonia rupestris Raf. (synonym) |
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| Houstonia tenuifolia forma leucantha Standl. (synonym) |
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| Houstonia umbellata Walp. (synonym) |
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| Houstonia varians Michx. (synonym) |
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| Oldenlandia purpurea var. ciliolata (Torr. ex Spreng.) A.Gray (synonym) |
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| Spermacoce lanceolata Frank ex C.Presl (synonym) |
|
