Goniothalamus monospermus is a species of plant in the family Annonaceae. It is native to Fiji. Asa Gray, the American botanist who first formally described the species using the basionym Richella monosperma, named it after its fruit's solitary seed (Latinized forms of Greek μόνος, mónos and σπέρμα, spérma) which have notable wing-like fringes.