The term 'tall-stemmed' is a compound adjective formed by combining 'tall' and 'stemmed'. 'Tall' originates from Old English 'tæl', meaning 'high' or 'lofty', and 'stemmed' is derived from the word 'stem', which comes from Old English 'stemn', meaning 'trunk' or 'main part'.

The word 'tall' evolved from Old English 'tæl', while 'stemmed' is derived from the noun 'stem', which has been used since Old English times.

The meaning has remained consistent, referring to the height or length of the stem of a plant.