'aplostemonous' originates from New Latin 'aplostemonus', ultimately from Ancient Greek, specifically the word 'haplostēmonos', where 'haplo-' meant 'single' and 'stēmōn' meant 'stamen'.

'aplostemonous' changed from the Greek compound 'haplostēmonos' into New Latin botanical usage 'aplostemonus' and was later adopted into English botanical terminology as 'aplostemonous'.

Initially it referred in Greek/Latin compounds simply to 'single stamen' or 'single-whorled stamen structure'; in modern botanical English it retains this specialized sense of 'having a single whorl of stamens'.