'several-flowered' is an English compound formed from 'several' + 'flower' + the adjectival/past-participial suffix '-ed'. 'Several' ultimately comes from Old French 'several' (from Latin elements related to 'separare'), where the root 'separ-' meant 'to separate' or 'distinct'. 'Flower' comes via Old French 'flor' from Latin 'flos, floris', where 'flos' meant 'flower'.

'several' entered Middle/Old French and then Middle English with senses of 'separate' or 'distinct' and later 'more than one (but not many)'; 'flower' came from Latin 'flos' into Old French and Middle English; the combination as an adjectival compound (X-flowered) developed in Early Modern English to describe the number or arrangement of flowers, resulting in 'several-flowered'.

Initially, elements meant 'separate/distinct' (from 'several') and 'flower' (bloom); over time the compound came to mean specifically 'bearing several flowers' rather than implying separateness in a non-botanical sense.