It consists of four closely related species, all of which are endemic to Western Australia; namely B. ser.

He also remarked that "the series is probably derived from the Orthostylis, which can in hingsight be read as an admission of paraphyly.

Crocinae in George's 1981 arrangement may be summarised as follows: In 1996, Kevin Thiele and Pauline Ladiges undertook a cladistic analysis of morphological characters of Banksia, which yielded a phylogeny somewhat at odds with George's taxonomic arrangement.

Crocinae:[2] B. ornata B. serrata B. aemula B. candolleana B. sceptrum B. baxteri B. speciosa B. menziesii B. burdettii B. victoriae B. hookeriana B. prionotes B. ser.

[2] 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.

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