According To George
When Alex George published his revision of Dryandra in 1996, he recognised that D. bipinatifida possessed a number of very distinctive characters, especially in its fruiting structure. These include unusually large follicles and seeds; seeds that are set within the seed wings rather than along the base or one side; and unusual double wings that are attached to each side of the seed. In addition, the species has extremely long involucral bracts, and floral bracts that enlarge more than any other species. Recognising the need for this species to be placed in its own subgenus, George resurrected Diplophragma, promoting it to subgenus rank as D. subg. Diplophragma.
The placement and circumscription of D. subg. Diplophragma in George's arrangement, as amended in 1999 and 2005, may be summarised as follows:
- Dryandra (now Banksia ser. Dryandra)
- D. ser. Dryandra (24 series, 91 species, 39 subspecies, 23 varieties)
- D. ser. Hemiclidia (2 species)
- D. subg. Diplophragma
- D. bipinnatifida (now Banksia bipinnatifida)
Read more about this topic: Dryandra Subg. Diplophragma
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