Zygadenus gramineus
Death camas is common in Saskatchewan and Alberta, and is usually found in upland draws and depressions. The plants reach a grazable height before most grasses so are most dangerous in the spring. All parts of the plant are poisonous, especially the bulbs, which may be confused with the wild onion. A lethal dose is considered to be 2 to 2.5 pounds of the green weight of the plant per 100 pounds of body weight. Symptoms appear from one and a half hours to eight hours after eating parts of the plant. They consist of abdominal pains, nausea, vomiting, trembling, muscular weakness, struggling for breath, lowered body temperature, coma and death.
The USDA Poisonous Plant Research Laboratory site has more information on death camus.
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