Pimenov & Kljuykov (Rupr.) 2004 - Pimenov MG, Kljuykov EV (2008) Taxonomic revision of Pleurospermum Hoffm. and related genera of Umbelliferae III. The genera Physospermopsis and Hymenidium. Feddes Repertorium 111(7-8): 535-552. doi: 10.1002/fedr.20001110719.
There is no corrections for Hymenidium nanum yet.