Flowers c. 30-55 cm across, in all respects very much like R. hasseltii but perigone lobes with about 6-8 big whitish warts in radial and lateral direction and up to 10 in the basal rows, sometimes these blots more or less confluent in bizarre wavy edged configurations. Diaphragm opening rounded or angular, almost half as wide as the total diameter, 4-8 cm broad upper face light pinkish or whitish with about 25 radial series of 3 or 4 dark red circled dots; lower face above the insertion with 3 concentric series of stalked toadstool-like ramenta, with 5 mm long stalks and capped by 5-8 mm wide disks, towards the rim 5 concentric series of oval white blots, 12-15 mm wide and 8-10 mm in radial direction. Ramenta covering the inner face of the flower tube 10-12 mm long, partly branched, with swollen apices, papillose grainy, lower down shorter, c. 2 mm long. Male flowers with 20-25 anthers.
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