Water hemlock, Spotted cowbane: Herb grows to 1.8 meters. Hollow stem sectioned off like bamboo, may be purple or red striped. Small white flowers grow in groups to form umbels. Roots have hollow air chambers that when cut produce drops of yellow oil. *CAUTION* Very POISONOUS. Small amount causes DEATH!Grows in wet,moist ground like swamps,wet meadows,stream banks throughout U.S. & Canada.