Common Name: giant ragweed, great ragweedScientific Name: Ambrosia trifida L.Family Name: Asteraceae (Compositae) - Aster or Sunflower FamilyIdentification NotesLife Cyclenative annual, reproducing by seed Stems Leavesopposite and three lobed (sometimes 4 or 5, 4th and 5th small), large, rough- surfaced; upper leaves lanceolate, no lobes Flowersheads of green disc (tubulate) florets; male flowers in inverted receptacle, terminal racemes; female flowers axillary above