In the study of Nishii et al., 2015, it was not possible to conduct either DNA or morphological analyses for some species, and this meant that they could not be placed in any section with certainly. In botanical classification, this is referred to as “Incertae sedis” meaning “of uncertain placement”.
Streptocarpus burundianus
Streptocarpus exsertus
Streptocarpus masisiensis
Streptocarpus mbeyensis
Streptocarpus phaeotrichus
Streptocarpus capuronii
Streptocarpus semijunctus
Streptocarpus stenosepalus
Streptocarpus tsimihetorum