Thyrsacanthus is a genus of flowering plants in the family Acanthaceae, found in South America east of the Andes, typically in drier areas. Perennial shrubs, they were resurrected from Anisacanthus in 2010, leaving it with the North American species.
Species Currently accepted species include:
Thyrsacanthus angustissimus Thyrsacanthus boliviensis (Nees) A.L.A.Côrtes & Rapini Thyrsacanthus microphyllus A.L.A.Côrtes & Rapini Thyrsacanthus ramosissimus Moric. Thyrsacanthus ramosus (Nees) A.L.A.Côrtes & Rapini Thyrsacanthus secundus (Leonard) A.L.A.Côrtes & Rapini Thyrsacanthus sulcatus
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