Common Name: hollow-stemmed Joe-pye weed, trumpetweedScientific Name: Eupatorium fistulosum Barratt syn. Eupatoriadelphus fistulosus, Eutrochium fistulosumFamily Name: Asteraceae (Compositae) - Aster or Sunflower FamilyIdentification NotesLife Cyclenative perennial, reproducing by seed Stemsupright, stout, tall, unbranched, solid purple or green with purple streaks above, hollow, smooth, glaucous Leaveswhorled 4-7 per node, lanceolate narrow or broad, petioled, pubescent, margins blunt toothed with extend veins at points Flowersheads of purple to mauve or pink disk (tubulate) florets, 5-7 florets per head; terminal cluster, round topped becoming cylindrical