Filimban, F.Z. & Kumar, E.S.S. (2026) Revisiting the Taxonomy of Ophiorrhiza brunonis var. johnsonii (Rubiaceae), a Little-Known Endemic Species of the Western Ghats, India. Phytotaxa 744 (2): 191–196. https://doi.org/10.11646/phytotaxa.744.2.8