 In 1996 , Kevin Thiele and Pauline Ladiges published the results of a cladistic analysis of morphological characters of Banksia . They retained George 's <unk> and many of his series , but discarded his sections . B. ser . Abietinae was found to be very nearly monophyletic and so it was retained . It further resolved into four <unk> , so Thiele and Ladiges split it into four subseries . B. violacea appeared in the last of these : 
