Crocinae was found to be monophyletic, but B. ser. Banksia was paraphyletic with respect to it. To resolve this, Thiele and Ladiges abandoned B. ser.
Crocinae was determined to be a monophyletic group, whereas B. ser. Banksia exhibited a polyphyletic nature with respect to Crocinae. In order to resolve the classification issue, Thiele and Ladiges discontinued using B. ser.