'robust-flowered' originates from the combination of 'robust' and 'flowered', where 'robust' meant 'strong and healthy' and 'flowered' refers to having flowers.

'Robust' comes from the Latin word 'robustus', meaning 'strong', and 'flowered' is derived from the Old French 'florir', meaning 'to bloom'.

Initially, 'robust' meant 'strong and healthy', and 'flowered' meant 'having flowers'. The combination retains the original meanings.