- any of several poisonous plants of the parsley family, as Oxypolis rigidior, of swampy areas of North America, or the water hemlock, Cicuta maculata.
- any of several N temperate poisonous umbelliferous marsh plants of the genus Cicuta, esp C. virosa, having clusters of small white flowers
- a similar and related plant, Oxypolis rigidior of the southeastern and central US
- any umbelliferous plant reputed to be poisonous to cattle
