Mountain Laurel (Kalmia latifolia). Deadly parts: Leaves, twigs, flowers, and pollen.Toxic toll: Mountain laurel parts are full of andromedotoxins, which go to town on your gastrointestinal tract. Watering of the mouth, eyes, and nose are common, as is shortness of breath and slow heartbeat. Kidney failure can occur, as well as convulsions, paralysis, coma, and death.Photo by Flickr user James Gaither
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