Takeuchi, W. 2014. Notes on <em>Phyllanthera</em> (Apocynaceae) from the upper Sepik of Papua New Guinea: <em>P. lancifolia</em> and <em>P. piforsteriana</em> sp. nov. Phytotaxa. 163, 3 (Mar. 2014), 173–179. DOI:https://doi.org/10.11646/phytotaxa.163.3.4.