According To Bentham
Along with many of Meissner's infrageneric taxa, which were overly reliant on leaf characters, Bentham discarded D. sect. Diplophragma in his 1870 arrangement. Despite having seen only a few seeds, he correctly observed that the characters of the fruit upon which Brown based the section were not constant:
"n the few seeds that I have been able to examine, the separation of the integument from the nucleus when not consolidated with the corresponding integument of the other seed has not appeared to me to be at all constant. The whole question requires further investigation on the part of those who may have a sufficient supply of good fruits of the several species."Bentham also recognised that the two species placed in D. sect. Diplophragma by Meissner are not closely related; he placed D. bipinnatifida in D. sect. Aphragma, and D. preissii in D. sect. Eudryandra ser. Niveae.
Read more about this topic: Dryandra Subg. Diplophragma
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“The principle of asceticism never was, nor ever can be, consistently pursued by any living creature. Let but one tenth part of the inhabitants of the earth pursue it consistently, and in a day’s time they will have turned it into a Hell.”
—Jeremy Bentham (1748–1832)