most poisonous plants on earth
1 Also present are ricinine, an alkaloid, and an irritant oil. 2  According to the 2007 edition of the Guinness Book of World Records, the castor oil plant is the most poisonous in the world, though its cousin abrin, found in the seeds of the jequirity plant, is arguably more lethal. One of the most toxic plants found in the Western hemisphere, all parts of the plant contain tropane alkaloids. 2  The active agents are atropine, hyoscine (scopolamine), and hyoscyamine, which have anticholinergic properties.
Water hemlock. Cicuta, commonly known as water hemlock, is a small genus of four species of highly poisonous plants in the family Apiaceae.Water hemlock is considered one of North America's most toxic plants, being highly poisonous to humans.en most deadly plants in the world. Jimson Weed. Datura stramonium, known by the common names Jimson weed, Devil's snare or datura, is a plant in the Solanaceae family. It is believed to have originated in the Americas, but is now found around the world. Rhododendron.