 Twenty years later, Brown published a further eleven species and the first infrageneric arrangement in his "Supplementum primum prodromi florae Novae Hollandiae".By this time, Brown had observed the tendency in "D. falcata" for one of the two ovules in each follicle to abort, thereafter developing into a winglike appendage to the seed separator.On this basis, he transferred the species into a monotypic genus, which he named "Hemiclidia", from the Greek "hemi" ("half") and perhaps "kleidos" ("barrier", "means of closing").