We document 558 of the 5,597 accepted species in Acanthaceae. The rest are listed, with their authorities and their identifiers, inside their genus. They have no page of their own because we could not find three openly licensed photographs of them, and a page without evidence is not a page we are willing to publish.
Real genera, accepted by World Flora Online, for which we have not yet found three commercially licensed photographs of any species. They are listed rather than hidden.