This section is from the book "A Guide To The Poisonous Plants And Weed Seeds Of Canada And The Northern United States", by Robert Boyd Thomson, H. B. Sifton. Also available from Amazon: A guide to the poisonous plants and weed seeds of Canada and the northern United States.
Miss Fyles reports cases from different parts of Canada where animals have died from the effects of Water Parsnip. Symptoms and treatment have not been worked out. The poison apparently acts on the kidneys.
It is common in wet places and of wide distribution. It is an upright branching plant from two to six feet high. The pinnately compound leaves have long, narrow, sharply toothed leaflets. The lower ones are long petiol-ed, the upper almost sessile. The white flowers are borne in compound umbels with narrow bracts.