Bridson (K.Krause) 1979 - Bridson DM (1979) Studies in Tarenna Sensu Lato (Rubiaceae subfam. Cinchonoideae) for Part 2 of 'Flora of Tropical East Africa: Rubiaceae'. Kew Bulletin 34(2): 377-402. doi: 10.2307/4110002.
There is no corrections for Tarenna pavettoides subsp. friesiorum yet.