Their cladogram contained a clade that corresponded closely to George's B. ser.

Leptophyllae was formally defined as containing those taxa with "indurated and spinescent common bracts on the infructescence axes, and densely arachnose seedling stems."

Leptophyllae in Thiele and Ladiges' arrangement may be summarised as follows:[1] 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.

[3] Since 1998, Austin Mast has been publishing results of ongoing cladistic analyses of DNA sequence data for the subtribe Banksiinae.

Leptophyllae, Mast's results accord closely with the arrangement of Thiele and Ladiges, inferring a polytomous clade corresponding exactly with Thiele and Ladiges' subseries, with B. grossa (Coarse Banksia) as the nearest outgroup:[4][5][6] Early in 2007 Mast and Thiele initiated a rearrangement of Banksia by transferring Dryandra into it, and publishing B. subg.

Mast and Thiele have foreshadowed publishing a full arrangement once DNA sampling of Dryandra is complete.