Notes
:
This section included four species that are no longer classified in Exostema, and it does not appear to have been typified. Its species are now included in, in order of presentation by Candolle, Schizocalyx, Bahysa, Rustia, and Coutarea. This section is not a recognized taxonomic group now. A lectotype was designated by Taylor & Maldonado (2023), making this a synonym of Bathysa.
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