This section is from the book "Botanic Drugs Their Materia Medica, Pharmacology and Therapeutics", by Thomas S. Blair. Also available from Amazon: Botanic Drugs, Their Materia Medica, Pharmacology and Therapeutics.
Daffodil, various Amaryllidaceae, especially the Narcissus pseudonarcissus. Common garden bulbs that cause violent vomiting and diarrhea if ingested, and may cause an eruption if applied externally.
The bulbs, at certain stages of growth, contain alkaloids analogous to atropine. Homeopathic physicians employ narcissus in coryza, whooping cough, and bronchitis.