'deviant-flowered' is a compound formed in modern English from 'deviant' + 'flowered'; 'deviant' derives from Latin 'deviare' (via Old French/Latin influence) where 'de-' meant 'away' and 'via' meant 'way', and 'flowered' is the adjectival/past-participial form of 'flower' (to produce flowers).

'deviant' comes into English via Medieval/early modern usage from Latin 'deviare' and French forms of the verb 'deviate'; 'flowered' developed from Old English 'flōwer'/'flor' (via Germanic) with the -ed suffix forming adjectives meaning 'having flowers'. The compound 'deviant-flowered' is a specialized botanical formation in modern English.

Individually, 'deviant' originally carried the sense 'turned away' or 'off the path' and evolved to mean 'departing from the norm'; 'flowered' historically meant 'having produced flowers' and as a modifier 'having flowers of a specified kind'. Combined, they now denote 'having flowers that depart from the normal form.'