Definition of joe-pye weed in US English:

joe-pye weed

(also joe pye weed)

noun

North American
  • A tall North American perennial plant of the daisy family that bears clusters of small purple flowers.

    Genus Eupatorium, family Compositae, several species, in particular sweet joe-pye weedE. purpureum and spotted joe-pye weedE. maculatum

    • ‘Plants at Holliday Park that are usually confined to fens are swamp blue aster, speckled joe-pye weed, and a rather rare species of pink turtlehead.’
    • ‘Others are swamp blue aster, a pink turtlehead, speckled joe-pye weed, great lobelia, Pennsylvania buttercup, and several kinds of sedges.’

Origin

Early 19th century: of unknown origin.

Pronunciation

joe-pye weed

/ˈjōpī ˌwēd/