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.
Lily of the Valley, Convallaria majalis L., is sometimes responsible for poisoning due to the presence of a very poisonous crystalline compound. It has an emetic and purgative action and a depressing effect on the heart. If sufficient quantites are eaten death results from paralysis of the heart.
Its two broad, entire leaves and spike of nodding, scented, white flowers are too well known to need special description.
Fig. 29. - Jack-in-the-Pulpit - Arisaema triphyllum.