Field of Science

Showing posts with label toxic. Show all posts
Showing posts with label toxic. Show all posts

Weed of the week - pokin' around

The late summer and fall is when people notice that a huge, attractive looking weed has invaded their yard/garden/alley.  You can hardly miss a plant with big green leaves that stands anywhere from 4 to 8 feet tall on a red stem that is 1-2 inches in diameter.  Also notable are quite handsome racemes of dark purple to black, glossy berries.  There are some ornamental varieties of some other species. This is Phytolacca americana, pokeweed or just poke.  Warning: ALL PARTS OF THIS PLANT ARE TOXIC - DO NOT CONSUME, and if you are a sensitive skin type person, avoid the sap.  This plant is a perennial so a mature plant is not killed by cutting off the stem; you must poison the big old white tap root. or dig it out. The young shoots have been gathered and boiled as greens made famous by the song "polk salad (sallet) Annie".  Changes of water are needed to detoxify the greens and its least toxic when young; it scares TPP too much to even try it, And what would be left anyways.  In this case the "salad" stands for sallet in the British/French (?) sense of cooked greens.  Birds and even some small mammals seem able to eat the fruits with no ill effects, so too many seedlings appear under our bald cypress, a favorite perching tree. Best to pull seedlings or chop them off before they get that tap root formed.  
 Here's a flowering inflorescence; the flowers are small with 5 sepals that are persistent.
 This is an older inflorescence showing a sequence of fruit development.  It happens pretty fast.
 This is a nearly mature infructescence showing the round, slightly flattened purple/black berries.  Kids could easily eat any berries this attractive.  Note that the sepals have turned bright pink; thus prolonging their attractiveness even after a berry is removed.
This shows the foliage, a rather simple leaf and the distinctive pink stems.  

Fall Fungi - Fly Agaric

Here's a link to some nice images of fly agarics (Amanita muscaria). They are a very spectacular mushroom, large, colorful!  TPP's best advice; don't eat them. They are extremely toxic and while hallucinogenic, way too scary for even an adventurous botanist. A mild fall and quite a bit of rain have been very good to the fungi. 

How can something toxic be healthy, a reader asks.

A reader asks, via email, since the comment button on my blog seems to be broken, how can something toxic be healthy? The explanation is pretty simple. Toxic is not synonymous with poisonous. Toxic substances in effective dosages generate non-nutritional physiological responses called intoxications, and different toxins produce different intoxications. So different toxins may be depressants (morphine) or stimulants (caffeine). Some may effect cures and others may be deletrious to deadly, often depending upon dosage.