Idiothamnus is a genus of South American flowering plants in the sunflower family. Species 1. \n* Idiothamnus clavisetus (V.M.Badillo) R.M.King & H.Rob. - Venezuela 2. \n* Idiothamnus lilloi (B.L.Rob.) R.M.King & H.Rob. - Argentina (Salta + Tucumán) 3. \n* Idiothamnus orgyaloides (B.L.Rob.) R.M.King & H.Rob. - Peru 4. \n* Idiothamnus pseudorgyalis R.M.King & H.Rob. - Distrito Federal do Brasil, Rio de Janeiro