Thiele and Ladiges' arrangement remained current only until 1999, when George's treatment of the genus for the Flora of Australia series of monographs was published. This was essentially a revision of George's 1981 arrangement, which took into account some of Thiele and Ladiges' data, but rejected their overall arrangement.
Thiele and Ladiges' arrangement remained relevant until 1999 when George revised the genus for the Flora of Australia series. This revision was based on George's 1981 work, which included some data from Thiele and Ladiges but did not follow their overall organization.