'stamened' derives from the noun 'stamen', which originates from Latin 'stamen' meaning 'warp, thread'; English formed the adjective by adding the suffix '-ed' (denoting 'having').

'stamen' entered botanical New Latin from Latin 'stamen' ('warp, thread') and was adopted into English in the 17th century to denote the male part of a flower; the English adjective 'stamened' was formed later by adding the productive English adjectival suffix '-ed' to indicate 'having stamens'.

Initially, Latin 'stamen' meant 'warp' or 'thread'; in botanical usage the word was applied to thread-like parts of flowers and evolved to mean the male reproductive organ of a flower; 'stamened' now means 'having stamens'.