Croat, T. & Yu, G.: Four new species of Philodendron (Araceae) from South America. — Willdenowia 36: 885–894. — ISSN 0511-9618; © 2006 BGBM Berlin-Dahlem. doi:10.3372/wi.36.36220 (available via  http://dx.doi.org/)

Four species of Philodendron sect. Macrobelium, namely P. huaynacapacense from Peru and Bolivia, P. rimachii from Peru, P. ushanum from French Guiana and P. wadedavisii from NW Brazil and SE Colombia, are described as species new to science and illustrated.