Plants containing cardiac glycoside include oleander (Nerium oleander), foxglove (Digitalis purpurea) and lily of the valley (Convallaria majalis). These glycosides slow down the heartbeat and can even stop it. These plants are toxic in all species. These are typically outdoor/landscape plants, but the popular and beloved lily of the valley is a common bouquet flower for winter arrangements, weddings and other holiday gatherings.
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