1.Kalmia latifoli,
Kalmia latifolia, more commonly known as mountain laurel, produces delicate pink and white flowers in the late spring. It’s the state flower of both Pennsylvania and Connecticut, and it grows just about everywhere in the eastern United States. It’s gorgeous, but underneath that dainty exterior beats the heart of a murderer.
The two main toxins inKalmia latifoliaare andromedotoxin and arbutin, but it’s the first one that you need to worry about. Andromedotoxin simultaneously causes part of the heart to beat quickly and part to beat dangerously slowly. In healthy people, the heart has a natural gate that blocks half of the electrical pulses coming to the organ. The toxin induces Wolff-Parkinson-White (WPW) syndrome, which disrupts that gate, letting all the pulses reach your heart. The result? Sudden cardiac death.
But that only happens with large doses. In smaller doses, you can expect to start with a lot of vomiting, after which every hole in your head will leak its fluidsdown your face. About an hour later, your breathing will slow down, you’ll lose the ability to use your muscles, and you’ll slip into a coma and die.
The terrifying part is that you don’t have to eat the flowers— honey from beesthat have visitedKalmia latifoliacontains all the toxic properties of the flower itself. The Greeks called it “ mad honey,” and they used it to defeat Xenophon of Athens in 400 B.C.
2.Veratrum,
Found on nearly every mountain in the Northern Hemisphere,Veratrumspecies put out gorgeous spiral clusters of white, heart-shaped flowers. The plant is commonly grown for ornamental purposes because even the leaves look pretty, and in the wild, it’s commonly confused with garlic. But pretty or not, every piece of this plant, from the roots to the pistils, is lethally toxic.
The first symptom of Veratrum poisoning is violent stomach cramping, which usually starts about 30 minutes after ingestion. As the toxins absorb into the bloodstream, they make a beeline for the sodium ion channels. Sodium ion channels act like gates to allow sodium to flow through nerves, triggering an action. For example, the opening of sodium ion channels in muscle cells starts the process that leads to a muscle contraction.
WhenVeratrum toxins hit the sodium ion channels, they open the floodgates, forcing the channels to fire continuously. The body doesn’t know what to do with this, so the heart begins to alternately slow and speed up. Muscles all over the body convulse. Eventually, the toxin either causes a heart attack or a coma. It’s believed that this is the poison that killed Alexander the Great.
3.Zantedeschia
The gorgeous perennial Zantedeschia has been introduced to every continent but Antarctica and is a staple in ornamental gardens. It’s often called a calla lily, even though it’s not even remotely related to lilies and doesn’t look anything like one. The bright, tube-shaped flowers can be a variety of colors.
Zantedeschia species contain calcium oxalate, a chemical that forms needle-like crystals inside internal organs. More than 1,000 types of plants contain calcium oxalate, and Zantedeschia is one of the most dangerous, partly because it’s so widespread. Even a tiny dose of the chemical is enough to cause a person’s throat to swell, usually along with an intense burning feeling.
The more you eat, the worse the symptoms become, until your throat swells so large it squeezes your airways shut. In one incident, a Chinese restaurantaccidentally put the flower petals from a toxic plant into their food, putting everyone who ate it in the hospital.