'mutant-flowered' originates from Modern English, formed by combining 'mutant' + 'flowered', where 'mutant' referred to something that has undergone a mutation and 'flowered' meant 'having flowers'.

'mutant' ultimately derives from Latin 'mutans'/'mutare' (to change) via scientific/modern Latin usage and French influence; 'flowered' comes from Old French 'flor'/'fleur' and Latin 'flos, floris' (flower), and the compound was created in recent English botanical usage by joining the two elements.

Initially the components meant 'changing' (mutant) and 'having flowers' (flowered); combined in modern botanical contexts they specifically denote 'having altered or abnormal flowers', a meaning that developed with genetic and morphological study.