 This clade became the basis of Thiele and Ladiges ' B. subser . Occidentales , which was defined as " characterised by opposite @-@ <unk> seedling leaves and adult leaves in true whorls . " This arrangement stood until 1999 , when George largely reverted to his 1981 arrangement in his monograph for the Flora of Australia series . Under George 's taxonomic arrangement of Banksia , B. verticillata 's taxonomic placement may be summarised as follows : 
