Serjania is a large genus of approximately 226 species of more or less woody vines, with essentially climbing habit, native to tropical and subtropical areas of the New World. This genus is well known for its ichthyotoxic activity (fish poison). Identification of Serjania species is particularly difficult because many of them are vegetatively very similar. Serjania section Platycoccus is characterized by its membranous samaroid mericarps with flat locules.This treatment recognizes 13 species of Serjania section Platycoccus . Included in this treatment are a phylogenetic analysis of the section; keys; descriptions; black and white illustrations; distribution maps; habitat information; and information on morphology and anatomy. along with accompanying images.