[1] : The Collaborative International Dictionary of English v.0.48

joe-pye weed \joe`-pye" weed`\ bot.
   a tall composite plant of the genus eupatorium eupatorium
   purpureum, with purplish flowers, and whorled leaves.
   1913 webster
see also:
eupatorium eupatorium purpureum 

[2] : WordNet (r) 2.0

joe-pye weed
     n 1: north american herb having whorled leaves and terminal
          clusters of flowers spotted with purple syn: purple
          boneset, trumpet weed, marsh milkweed, eupatorium
          purpureum
     2: north american herb having whorled leaves and terminal
        clusters of small pinkish or purple flower heads syn: spotted
        joe-pye weed, eupatorium maculatum
see also:
purple boneset trumpet weed marsh milkweed eupatorium purpureum spotted joe-pye weed eupatorium maculatum 

Joe-Pye Weed >> J Words
Joe-Pye Weed, definition of term: Joe-Pye Weed
joe-pye+weed_pag1.html

Jimson Weed >> J Words
Jimson Weed, definition of term: Jimson Weed
jimson+weed_pag1.html

Dill Weed >> D Words
Dill Weed, definition of term: Dill Weed
dill+weed_pag1.html