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POISONOUS PLANTS
Successful use of
plants in a survival situation depends on positive
identification. Knowing poisonous plants is as important
to a survivor as knowing edible plants. Knowing the poisonous
plants will help you avoid sustaining injuries from them.
HOW PLANTS POISON
Plants generally poison by—
Ingestion. When a person eats a part of a poisonous plant.
Contact. When a person makes contact with a poisonous plant that
causes any type of skin irritation or dermatitis.
Absorption or inhalation. When a person either absorbs the
poison
through the skin or inhales it into the respiratory system.
Plant poisoning ranges from minor irritation to death. A common
question
asked is, “How poisonous is this plant?” It is difficult to say
how
poisonous plants are because–
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Some plants require contact with a large amount of the plant
before
noticing any adverse reaction while others will cause death with
only
a small amount.
Every plant will vary in the amount of toxins it contains due to
different
growing conditions and slight variations in subspecies.
Every person has a different level of resistance to toxic
substances.
Some persons may be more sensitive to a particular plant.
Some common misconceptions about poisonous plants are—
Watch the animals and eat what they eat. Most of the time this
statement
is true, but some animals can eat plants that are poisonous to
humans.
Boil the plant in water and any poisons will be removed. Boiling
removes many poisons, but not all.
Plants with a red color are poisonous. Some plants that are red
are
poisonous, but not all.
The point is there is no one rule to aid in identifying
poisonous plants.
You must make an effort to learn as much about them as possible.
ALL ABOUT PLANTS
It is to your benefit to learn as much about plants as possible.
Many poisonous
plants look like their edible relatives or like other edible
plants. For
example, poison hemlock appears very similar to wild carrot.
Certain plants
are safe to eat in certain seasons or stages of growth and
poisonous in other
stages. For example, the leaves of the pokeweed are edible when
it first
starts to grow, but it soon becomes poisonous. You can eat some
plants and
their fruits only when they are ripe. For example, the ripe
fruit of mayapple
is edible, but all other parts and the green fruit are
poisonous. Some plants
contain both edible and poisonous parts; potatoes and tomatoes
are common
plant foods, but their green parts are poisonous.
Some plants become toxic after wilting. For example, when the
black
cherry starts to wilt, hydrocyanic acid develops. Specific
preparation
methods make some plants edible that are poisonous raw. You can
eat
the thinly sliced and thoroughly dried corms (drying may take a
year) of
the jack-in-the-pulpit, but they are poisonous if not thoroughly
dried.
Learn to identify and use plants before a survival situation.
Some
sources of information about plants are pamphlets, books, films,
nature
trails, botanical gardens, local markets, and local natives.
Gather and
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cross-reference information from as many sources as possible,
because
many sources will not contain all the information needed.
RULES FOR AVOIDING POISONOUS PLANTS
Your best policy is to be able to look at a plant and identify
it with absolute
certainty and to know its uses or dangers. Many times this is
not
possible. If you have little or no knowledge of the local
vegetation, use
the rules to select plants for the “Universal Edibility Test.”
Remember,
avoid —
All mushrooms. Mushroom identification is very difficult and
must be
precise, even more so than with other plants. Some mushrooms
cause death very quickly. Some mushrooms have no known antidote.
Two general types of mushroom poisoning are gastrointestinal and
central nervous system.
Contact with or touching plants unnecessarily.
CONTACT DERMATITIS
Contact dermatitis from plants will usually cause the most
trouble in
the field. The effects may be persistent, spread by scratching,
and are
particularly dangerous if there is contact in or around the
eyes.
The principal toxin of these plants is usually an oil that gets
on the skin
upon contact with the plant. The oil can also get on equipment
and then
infect whoever touches the equipment. Never bum a contact
poisonous
plant because the smoke may be as harmful as the plant. There is
a
greater danger of being affected when overheated and sweating.
The
infection may be local or it may spread over the body.
Symptoms may take from a few hours to several days to appear.
Signs and
symptoms can include burning, reddening, itching, swelling, and
blisters.
When you first contact the poisonous plants or the first
symptoms appear,
try to remove the oil by washing with soap and cold water. If
water
is not available, wipe your skin repeatedly with dirt or sand.
Do not use
dirt if blisters have developed. The dirt may break open the
blisters and
leave the body open to infection. After you have removed the
oil, dry
the area. You can wash with a tannic acid solution and crush and
rub
jewelweed on the affected area to treat plant-caused rashes. You
can
make tannic acid from oak bark.
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Poisonous plants that cause contact dermatitis are—
Cowhage.
Poison ivy.
Poison oak.
Poison sumac.
Rengas tree.
Trumpet vine.
INGESTION POISONING
Ingestion poisoning can be very serious and could lead to death
very
quickly. Do not eat any plant unless you have positively
identified it first.
Keep a log of all plants eaten.
Signs and symptoms of ingestion poisoning can include nausea,
vomiting,
diarrhea, abdominal cramps, depressed heartbeat and respiration,
headaches,
hallucinations, dry mouth, unconsciousness, coma, and death.
If you suspect plant poisoning, try to remove the poisonous
material
from the victim’s mouth and stomach as soon as possible. Induce
vomiting
by tickling the back of his throat or by giving him warm
saltwater, if
he is conscious. Dilute the poison by administering large
quantities of
water or milk, if he is conscious.
The following plants can cause ingestion poisoning if eaten:
Castor bean.
Chinaberry.
Death camas.
Lantana.
Manchineel.
Oleander.
Pangi.
Physic nut.
Poison and water hemlocks.
Rosary pea.
Strychnine tree.
See Appendix C for photographs and descriptions of these plants.
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