The number of stamens in the family Aristolochiaceae range between 6 and 46. This range has been speculated to be a reduction series; nevertheless, not even a single taxon within the family is so far known to possess staminodial appendages. Floral anatomical studies of the three morphotypes of the species Thottea siliquosa (Lamk.) Ding Hou referred by three taxonomically synonymous nomenclatural species, viz. Apama siliquosa Lamk., Bragantia dalzellii Hook. f. and B. wallichii W. & A., brought to light the existence of staminodes.