National Park Service - Water Chestnut http://www.nps.gov/plants/alien/pubs/midatlantic/trna.htm Water Chestnut (Trapa natans) http://www.nps.gov/plants/alien/pubs/midatlantic/trna.htm http://www.nps.gov/plants/alien/pubs/midatlantic/trna.htm Trapa natans Water chestnut Water Chestnut http://www.nps.gov/plants/alien/pubs/midatlantic/trna.htm http://www.nps.gov/plants/alien/pubs/midatlantic/trna.htm http://www.nps.gov/plants/alien/pubs/midatlantic/trna.htm PCA water chestnuts National Park Service