According To Brown
Diplographma was first published by Brown in his 1830 Supplementum primum prodromi florae Novae Hollandiae. Brown's arrangement divided Dryandra into three groups according to what Brown perceived to be variations in the number of seed separators. He allowed for these groups to be treated at subgenus or section rank, but they are now treated as having been published as sections.
D. sect. Diplophragma was defined as containing a single species, D. bipinnatifida (now Banksia bipinnatifida), which Brown thought contained two seed separators. The epithet Diplophragma is from the Greek diplo ("two") and phragma ("barrier"). It is not clear how Brown came to believe that this species has two seed separators, as it actually has none.
The placement and circumscription of D. sect. Diplophragma in Brown's 1830 arrangement may be summarised as follows:
- Dryandra (now B. ser. Dryandra)
- Dryandra verae (18 species)
- D. sect. Diplophragma
- D. bipinnatifida (now B. bipinnatifida)
- D. sect. Aphragma (4 species)
- Hemiclidia (1 species)
Read more about this topic: Dryandra Subg. Diplophragma
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