Thereianthus is a genus of flowering plants in the family Iridaceae, first described as a genus in 1941. The entire genus is endemic to Cape Province in South Africa. The genus name is derived from the Greek words thereios, meaning "summer", and anthos, meaning "flower".
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0