Ageratina helenae R.M. King & H. Rob. Ageratina helenae R.M. King & H. Rob. in Phytologia. 24(2): 90. 1972 sec. Ulloa Ulloa & al. 2018=Ageratina reserva B.L. Turner in Phytologia 94(2): 232, fig. 3. 2012 syn. sec. POWO 2019