Hey, can I ask a favour? I'm writing a book, and I wonder if you can tell me some plants that would act as good poisons? Both fatal and not. And something that could be used in torture. (I promise this is for a book!) Thanks.
Ah, going Tory-hunting, are we? Good good. “For a book”, got it.
Okay! So, yes, is the answer. I don’t know how broadly you want to go into the World Of Plants, in terms of global distribution? But since you’re asking me, I’m guessing you want some UKvian/north west European answers. I also don’t know how historical you need me to be, so I’ll stick to natives where I can.
Also, it should be noted that pretty much any plant can kill you if you eat enough of it? But I’m assuming you want something a bit more ‘contained in a mysterious phial’ or ‘chopped into a soup’ rather than ‘six tonnes of common daisy, eat up, Your Majesty’.
The foxglove (Digitalis purpurea). Very pretty plant that loves hedges and forests and occasionally comes in white:
You know that scene in Casino Royale where Bond is poisoned and has to shoot himself up in his car to not die? That was digitalis, i.e. the active compound in these things. It fucks up your heart and that. In fact, the medicinal compound that has been scientifically extracted from digitalis - digoxin - is used in modern medicine, but straight from the plant is toxic.
It’s possible to simply really fuck someone up with these, but very easy to outright kill them, and a fine line to walk. It wouldn’t be easy to intentionally give them just a low dose.
Deadly Nightshade, (Atropa belladonna). I like this one! In extremely low doses it’s a herb, actually, so there’s even narrative Plausible Deniability for it being in a kitchen/people getting overdosed.
This, on the other hand, is not:
That’s Woody Nightshade, or Solarum dulcamara, which is also poisonous but rarely fatally so, and seems to be plastered throughout the internet on primarily USian sites labelled as Deadly Nightshade.
Anyway. The berries and leaves are the deadly bits, and cause delirium and hallucinations. And, you know, death. This one is easier to control for effect than digitalis, mind, so you can poison or kill here. It’s also been used as a cosmetic, because it can make the pupils dilate, which as we all know, is the sexiest part of the human body.
It’s antidote is physostigmine, found naturally in the Calabar bean from Nigeria, although it is itself pretty poisonous. Or I think pilocarpine works, which is found in a South American plant, but I don’t know which.
The Yew Tree, (Taxus baccata). A particularly great entrant to any list, frankly. Love me a yew.
LOOK HOW BEAUTIFUL anyway, yew trees were worshipped by Celtic peoples as representing a Cult of Immortality, because they live for literally thousands of years. They are also almost entirely poisonous. Like… leaves, bark, wood seeds, everything. The only thing that isn’t, ironically, is the flesh of the berries, and as long as you didn’t chew - and therefore break - the seeds, they’d probably pass right through you and be fine. But as few as three seeds would poison you.
Also, most plants lose their toxins after pruning. Not yew. Cut branches are just as dangerous.
The fun bit is the symptoms, because most times, there aren’t any. You just die a few hours after eating. Some indigestion, like. That’s it. If there are, we’re looking at shaking, coldness, and falling over a lot.
Hellebore (Helleborus spp). Pretty plants that flower in winter, so people like them.
The roots are toxic, causing wicked D and V and also death if you eat too much. People used to give them to kids to try to de-worm them, and a lot of kids died that way.
Interestingly, though, the seeds in particular cause skin problems after contact - burning and itching, usually. Potentially a good Clue for who the poisoner is, if their hands are all itchy and that.
Ragwort (Senecio jacobaea). So, in the Real World there are precious few examples of people being poisoned by ragwort, though plenty of it happening to horses; but that’s because we’re generally pretty careful with the stuff, and also it’s not fatal to most.
The exception is people with liver problems.
Someone with any sort of liver condition could be killed by this stuff, because at high enough levels it will cause complete liver failure. But, you’d have to either make them eat about 14lbs of the plant in one go (unlikely), or you’d have to make them drink it as a herbal tea over a long period (more likely). The toxins don’t accumulate in the body, but the liver damage does. It was for a while considered to be a cough remedy, too, so it’s a good one for plausible deniability.
Symptoms include lethargy, staggering, walking around like a zombie, and sometimes blindness.
Hemlock Water-Dropwort (Oenanthe crocata). Yeah, this is hemlock, Famous Poison of Antiquity. They killed many a Greek philosopher with this stuff.
Great for plausible deniabilty - the full plant is almost identical to the fully-edible cow parsley, the stems can look like celery when chopped, and the roots look like wild parsnips. But, the toxins are quite unstable. Cooking can break them down - if not completely, then at least to survivable levels. But you’d still be sick as a dog from it, and you would need hospitalisation.
Vomiting and nausea are the main symptoms, but convulsions and seizures are also up there. And, of course, death. There’s also some suggestion that it’s more potent in winter, and less so from April onwards? It’s unproven as of yet, but it is an interesting pattern in toxicity levels.
Lords and Ladies/Cuckoopint (Arum maculatum). It has approximately 8003 common names, this one, but Lords and Ladies is poetic, and cuckoopint is an old word meaning a cuckoo’s dick, so those are the ones I’ve included.
Some people apparently mistake it for wild garlic, since they grow in the same places and times? i don’t see it myself, but I’m told it’s a common mistake.
It is poisonous, but you’d have a job eating enough to kill yourself - it induces vomiting fast, and a prickly burning in the mouth even faster, so you wouldn’t be able to ingest more. This is true of both the leaves and the berries. So a good one to make someone ill, and they’d be sore for days, but very unlikely to kill someone.
Greater Celandine (Chelidonium majus). No relation to lesser celandine. Botany is wild.
Anyway, the juice in the stem is bright yellow and can cause nausea if ingested, and burning on the skin; historically, it was used to remove warts. But it tastes disgusting, as so many of these do, so it would have to be masked somehow.
Spindle (Euonymous europaeus). Beautiful tree, five stars out of three.
Those are the berries! SO PRETTY but eating the berries will fuck you up nicely - D and V, heart palpitations, hallucinations and symptoms akin to meningitis. Unlikely to be fatal to a healthy person, mind.
Again, though, tastes like arse.
Hogweed (Heracleum sphondylium). Nawr te. Here we get nasty.
This is hogweed. Tip to tip it can be about 6 feet of chlorophylled malice, but usually it’s around the four-to-five mark. The reason for it’s inclusion here lies in the sap, which contains, essentially, a compound that turns you into a fucking vampire.
How? you may be asking. Well - through a condition called phytophotodermatitis, which is where the sap basically strips out your skin’s ability to slather on the melanin and so the moment UV light hits the spot it burns. And I mean burns. Literal burns. Want to see a gross picture?
Yeah. And it’s not a one-off burn - you have to keep the skin out of the sun for a year or so before it stops reacting, even after the burn is healed. I work with people who have had hogweed burns (in my line of work it’s a professional hazard), and even mild ones will still suddenly show up again in the shower six months later.
It’s not as bad as one of our new Invasive Species, though - Giant Hogweed (Heracleum mantegazzianum). That one burns. Google ‘giant hogweed burns’ for the grossest google session of your life. That causes literal third degree burns, and it’s a good six years before you’re back to normal. That’s only been about in UKvia for about 200 years, though.
In conclusion, you don’t fuck about with hogweed.
Stinging nettles (Urtica dioica). What list of Nast Plants would be complete without the humble stingy, eh?
We’ve all done our time with this bastard. Very common, touching the edges of the leaves produces a strong sting, a bit like mild bees. It’s entirely bearable, like, and actually, there are some people who whip their arthritic joints with nettles and report that it makes the swelling go down. But it’s not enjoyable, and being whipped with these would fucking hurt. Plus, it takes a while for the rash to fuck off.
It’s also highly nutritious and edible, though, and you can spin it into cloth. Non-stingy cloth, I might add. Go figure.
Blackthorn (Prunus spinosa). A wonderful tree that gives us sloes which give us delicious sloe gin.
But it also has thorns. Now - professional tree knowledge coming in here - in fact, in the moment it hurts more to be bitten by a hawthorn. But, hawthorns will merely bite, and are non-venomous.
Blackthorns are venomous. As long as you clean the cuts and, crucially, don’t leave thorns in you, you’re fine. But if you leave a thorn in you, it will give you septicemia, which can be extremely nasty. Potentially fatal, actually, so possibly this could go further up the page? Dunno how you’d manage that, though.
Anyway, that’s all I can think of offhand. I hope this is useful knowledge for your “book”.