All we can learn about this enigmatic species from the original description, based on a bud of 17 cm diam., is that the perigone lobes have numerous dense warts, the ramenta are simple or branched, not swollen at apex, the lower face of the diaphragm has only bristles, no warts, and the disk has many processes, pointed at the apex. The hairy laminae between the anther cavities and the shape of the anthers and many other details given by Koorders are shared by most species of Rafflesia and are of no diagnostic importance. A collection from the same huge general region of the Sekerat Mts was made on the Sangkulirang Peninsula by Kostermans, Sept. 1957, near Mapula(?) vilage. It consists of a male bud of 14 cm diameter with 40 anthers. This would make it likely that this specimen either belongs to R. keithii or that R. arnoldii occurs all the way from SW and C to NE Kalimantan. In case future field work on the Sekerat Mts would show that R. keithii is common there we have enough circumstantial evidence that specimens of that species were described by Koorders under the names R. witkampii and R. ciliata. The latter species name could be excluded from priority because of the lack of a convincing type specimen. It is not possible to solve this puzzle without the collection of new evidence in the field.
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