o ceallaigh's picture

Stupid Plant Tricks: Sensitive Plants and Other Wierdos

botany | Mimosa pudica | nori | O Ceallaigh: Science Belief and Society | seashore | seaweeds | teaching

When you make your living teaching others about plants, what they are, where they came from, and the hows and whys of doing research on them, you quickly discover that the first challenge to overcome is that of getting people’s attention. This was hard enough in the days before cell phones, Doom 3, and American Idol. Now? Well, that’s where the Stupid Plant Tricks come in.

I was reminded of this on the field trip to the Bodega Marine Laboratory, which is on the California coast about an hour’s drive or so north of San Francisco, that I participated in back at the end of April. The students on the trip, from the University of California at Merced, were your standard cell-phone-and-iPod crowd, rather new to the idea of an environment outside the house and the car. They were not fully prepared for the fact that the weather in California’s Central Valley in spring can be, um, a little different from the weather on the coast. Suffice to say that the students poured out of the bus in T-shirts, shorts, and sandals, to be greeted by yours truly in sweatshirt, rain jacket, stocking cap, and gloves. Some of the students spent a chilly night.

The next morning, we all went down to the shoreline and started to explore the rocks and tidepools, all festooned with beautiful and diverse marine plants, seaweeds if you like – which the students trampled and ignored in search of the animals. I expected this; after all, if you’re seeing the life that lives between high and low tide on the rocky shore of California for the first time, it’s going to be more fun chasing crabs and pulling orange starfish out of crevices than trying to work out which kind of seaweed it was that tripped you up and sent your crashing into a barnacle-studded boulder.

So I quietly collected a few things and waited, for when the time was right and I could spring my Stupid Seaweed Tricks on them. Nori, for example (genus Porphyra), the stuff in which your sushi roll is wrapped. Or Turkish towel (genus Chondracanthus), a source of carrageenan, which is found in ice cream, puddings, makeups, and other “creamy� food products and cosmetics. Or giant kelp (Macrocystis), which can grow 12 inches a day and, thanks to the alginic acid and its salts that it contains, also winds up in things like ice cream. It’s amazing how folks remember “That slimy stuff is in our ice cream�?!? Not to mention “It really grows a foot a day? That’s a lot of feet. Do they all smell?� Hey, whatever works.

My colleagues who teach flowering plants have a whole host of things that move, stink, or go bump in the night. Perfect examples of Stupid Plant Tricks. Venus Flytraps, of course. The Corpse Flower, a flytrap of a different kind that can attract every insect, and repel every human, for miles around. Bucket orchids that get their pollinating bees drunk. The Sensitive plant, which collapses at a touch.

For a long time I tried to grow sensitive plants. I didn’t have much luck. For one thing, they’re a tropical plant. They’re not much to look at in the best of times (they’re considered a weed in much of the tropics), but they really struggle in the cold and shade of a Maine winter, even indoors. For another, sensitive plants “wear out�. The characteristic “folding up� of a sensitive plant is an adaptation to grazing by animals like horses; the plant that "folds� when first touched might escape being eaten. However, a plant that is constantly touched will lose the “sensitive� response. It’s also likely to die on you. All in all, a plant with issues …

    The sensitive plant
    Mimosa pudica,
    The sensitive plant,
    Slouches from its starting place
    With crooked, clambering thin brown stems.
    In the sun
    It holds out soft feather leaves,
    Palms upward,
    Begging for warmth;
    Magenta puff flowers
    Advertise intimacy;
    But at a touch
    The leaves and flowers duck for cover,
    Exposing a tangle of dry twigs
    Studded with thorns.
    Touch it again:
    After awhile the leaves may stand the closeness.
    But they soon grow crisp and gray with the effort,
    Then fall off,
    Leaving the stems
    No longer sprouting,
    Brittle and crackly,
    Suited for tinder,
    Or for crumbling to dust.

   - O Ceallaigh

Copyright © 2006 Felloffatruck Publications. All wrongs deplored.

All opinions are mine as a private citizen.

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IntricateGirl's picture

LOL. I use your entries

LOL. I use your entries sometimes as a test for myself. I knew about nori, carrageenan, and kelp. I knew about the sensitive plants as well, except for the bucket orchid that I may know if I saw it. I knew that sensitive plants wore out. I also know that Venus Fly Traps will not reopen if they eat Asian Beetles. It rots them. I know that kelp is supposed to be great in weight loss, but it's really a little too agressive for any real use. I know that indigo makes a great blue dye that warriors painted themselves with, but it is difficult to grow, and woad replaced it. Woad is easy to grow- so easy that it is banned because it will take over the countryside like kudzu. I know that chamomile makes a great hair rinse for blonds, rosemary for brunettes, and cinammon for reheads. Henna would be better for redheads, but most boxed hair dyes aren't compatible with henna. I know that stevia is an herb that is 30 times sweeter than honey, and it doesn't give you problems if you have diabetes. I know that willowbark helps with headaches. And I know that the flower growing in my mother-in-law's garden was the original heart medication if you were having a heart attack.

See, used to be an herbalist. We are all about studying stupid plant tricks.

o ceallaigh's picture

Cool stuff, Intricate!

I know that kelp is supposed to be great in weight loss

'cause most of it is indigestible by humans. It's a vitamin and inert bulk source. Hence its utility in dieting. But it does have, er, gastrointestinal consequences if used to excess. Remember "fake fat" potato chips?

stevia is an herb that is 30 times sweeter than honey

I read "300 times". And it's under investigation as a possible for diabetes.

willowbark helps with headaches.

Ayup. Willow, genus Salix. Aspirin, acetoSALIcytic acid. Now you know where it came from.

flower growing in my mother-in-law's garden

That would be foxglove (Digitalis). Don't treat yourself with it, it's deadly.

:)

Evil_Bob's picture

Some of My Favorite Plants Are The Ones That...

...Have A Poisonous Nature To Them! The aforementioned foxglove is a spendorlishous cardiac failure inducing plant...Hyacinth, Narcissus, Daffodil bulbs if you are talking the household variety these are excellent for bringing on bouts of nausea, vomiting, diarrhea and in the proper volume can prove fatal. When I host a lavish dinner party or night of bridge I like to toss in a handful or two of Rosary Pea seeds and castor bean pods into the nut bowls and sprinkle a few into the dinner salads. Delightful to watch the insuing retching and convulsions of those unlucky to have consumed these devilish morsels! A single Rosary Pea seed has caused irreversable central nervous system shutdowns and death. And of course it only takes but one or two Castor Bean seeds to prove lethal for adults.-Ahhhh...How I do love The Bad Plants and The Bad Things You Can Do With Them!
MOOO-HA-HA-HA-HAAAAAAAAAAAAA!!

Evil_Bob

o ceallaigh's picture

An oleander salad to you, EB ...

... and remind me to turn down invitations to your poker parties. I'm out of souls to sell, and if you play strip and I lose, the sight will scare the demons back to Paradise.

:)

Evil_Bob's picture

O'C, I raise a glass to you Sir!

It is brimming over with the extracted juice of Bleeding Heart roots.Yum Yum In The Tum-Tum!
I know what are are thinking; "EB, those have been shown to be deadly if consumed"... and you are correct....bad for livestock, delicious in a tall smoothie. To You Good Sir, Cheers!

Evil_Bob

IntricateGirl's picture

Lol. I knew the names of

Lol. I knew the names of all the plants (except kelp, which when used medicinally is referred to by its cute medieval name- bladderwrack). I was giving the quickie version for anyone skimming my response to see whether there was anything worth reading. lol

Stevia, I was thinking one thing and typing another. Stevia is supposed to be 30 sweeter than SUGAR, not honey. I don't know what the conversion rate between sugar and honey is, but I always figured that honey was sweeter. Maybe not. Also, I only slightly comprehend "science speak". Was the article claiming that stevia is being used to TREAT diabetes, either as a treatment or a cure? Because if so, this is definitely new to me. I have been out of the herb business for a few years now, and all I knew was that stevia will not cause problems for diabetics. For example, my father was diabetic, and he could sweeten his tea with stevia without a problem. If that is what the article is getting at, that's fascinating. My favorite consipracy theory involves stevia, BTW. lol

Yes, there's a reason the plant stores sell foxglove with a tag that says it is deer resistant.

o ceallaigh's picture

kelp line

For what it's worth, "bladderwrack" is strictly a rockweed, not a kelp. There's a reason, but that's more pedantry than I can manage right now when I'm supposed to be proofreading DNA sequences.

What I saw was that one of the purified Stevia extracts is ca. 250 times sweeter than sucrose. Table sugar is sucrose, honey is glucose. Sucrose is sweeter, but I'd have to look it up to say how much. The "30 times sweeter than sugar" might refer to the plant itself, not one of its extracts.

Was the article claiming that stevia is being used to TREAT diabetes

It was suggesting that Stevia extracts should be investigated as a treatment for at least some forms of diabetes, because they are able to stimulate insulin production and lower blood glucose levels in mice. That's more than being diabetic-safe, and less than being the latest miracule pill from Pfizer.

I'm going to have to blog about the disconnect between the public conception of scientific studies touted in the media as "definitive miracles" and the realities of the research ... :)

IntricateGirl's picture

Interesting to know about

Interesting to know about bladderwrack. In the herbal community, there is sometimes a bit of confusion because so many names were assigned to the same herb, and some herbs have similar names that have nothing to do with each other. For example, there is boneset, which is Eupatorium perfoliatum. It also has the name "Thoroughwort". But there is a resin which comes from China, and occasionally people call it "boneset" as well. But this one is from Calamus Draco. So, it would not surprise me to hear that this is not a kelp, and that though the term is used in the herbal community to refer to any kind of greenish thing that comes from wet areas, that in ACTUALITY, it comes from only one plant. Confusing, I know.

Now it makes more sense. The extracts would be more concentrated. And even then, it would matter what method of extraction they used. Tinctures, essential oils, etc. And yes, the 30 times sweeter than sugar would be based on a standardized version of the raw plant. When herbs are standardized, they have the levels of different chemicals checked within the plant, and they grow it under controllable conditions so that the amounts of the chemicals do not change. Otherwise, you are subject to bad crops.

That's what I figured the article was saying, but I wanted to make sure. This is fascinating news, and no doubt it needs tested much more before they can count on it, but this sounds very promising.

Yes, blog about it sometime. I'll read. :D (You'll find that I am the most hesitant herbalist in existence. Several years ago, EVERYBODY heard that St. John's Wort can cure depression. So I started selling a lot of St. John's Wort. Frankly, there are a lot better treatments for depression, and if you MUST go the herbal route, then there are even better herbs, although I can't recall what they are now. Yet people were still depressed. It was frantic almost, the way they bought it.)

o ceallaigh's picture

Naming is a strange game

The birders have a consistent and reliable system of common names. Almost no one else does. For example, I would tell classes about bracken fern (a true fern), asparagus fern (a flowering plant - which actually are species of Asparagus), and air fern (dried and dyed red seaweed). Herbalist bladderwrack is almost certainly Ascophyllum nodosum, though it might also contain species of Fucus.

There's a lot of promising stuff that doesn't pan out. Reports in the 70s suggested that at least some of the stevosides are mildly mutagenic.

Don't get me started on depression and the various ways in which corporate America has exploited it. One way of looking at it: the American obsession with personal liberty has made us all into little boxes that have lost the ability to interact with each other without ducking into holes, or exploding. No wonder we're depressed ...

Out of 100 Men

How many will be reminded by your poem of a woman they used to know?

o ceallaigh's picture

Oh, I don't know, ...

... about 137, maybe.

:)

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