 In 1818, French botanist Henri Cassini described the new genus "Ictinus" with type species "piloselloides", but in 1824 reassigned it to "Gorteria", making the new combination "G. piloselloides".In 1820, Cassini erected the genus "Hirpicium" with type species "H. echinulatum".This however is an illegitimate name, since the type specimen is identical to that used by Thunberg to base "Oedera alienata" on in 1792, and the correct name would be "Hirpicium alienatum" (= "G. alienata").