Bautista, M.A.C., Chua-Mangussad, V., Cervancia, J. & Bustamante, R.A.A. (2024) Psychotria pendens (Rubiaceae, Psychotrieae), a new ultramafic species from Central Palawan, Philippines. Phytotaxa 649 (3): 252–260. https://doi.org/10.11646/phytotaxa.649.3.2