Prenanthes Serpens, Rattlesnake-Root, White Lettuce, Cancer Weed, Canker root

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 6 min read

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বাংলা রোগী নোট এখনো যোগ করা হয়নি। পোস্ট এডিটরে “RX Bangla Patient Mode” বক্স থেকে সহজ বাংলা সারাংশ যোগ করুন।

এই তথ্য শিক্ষা ও সচেতনতার জন্য। এটি ডাক্তারি পরীক্ষা, রোগ নির্ণয় বা প্রেসক্রিপশনের বিকল্প নয়।

Article Summary

This member of the Chicory family is an indigenous perennial herb, has a smooth stem, and grows 2–4 ft. high. The stem is stout and purplish, with radical leaves, lanceolate, and all irregularly dentate. This plant grows plentifully in moist weeds and in rich soils, from New England to Iowa, and from Canada to Carolina. It is a member of Asteraceae and tribe Cactaceae. Recently...

Key Takeaways

This article explains Lion’s Foot Plant Scientific Classification in simple medical language.

Educational health guideWritten for patient understanding and clinical awareness.

Reviewed content workflowUse writer and reviewer profiles for stronger trust.

Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
New weakness, severe pain, high fever, or symptoms after a serious injury.
Any symptom that feels urgent, unusual, or unsafe for the patient.

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

See a doctor

Book a professional medical evaluation if symptoms persist, worsen, recur often, affect daily activities, or occur in a high-risk patient.

Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

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Definition

Leaves are alternate and variable in shape i.e. deeply and irregularly lobed. Flowering stems are 1 to 2 meters tall and leaves are pinnately lobed. Paniculate inflorescence comprises of drooping capitula composed of ligulate flowers. Capitulate has 8 to 14 flowers with yellow to cream-colored corollas. Flowers are 8 to 14 mm long having lower had fused into a tube. Each flower produces a single achene topped by pappus which supports wind dispersal. An involucre comprises of two whorls of green bracts. The inner whorl has eight lance-shaped bracts about 8 to 14.5 mm long. An outer whorl has five to nine much shorter bracts. Its habitat is sandplain grasslands and also occurs in rocky slopes along roadsides and in other disturbed habitats. Usually, coarse stems have purple coloration exuding a milky sap when damaged.

Uses

The milky juice of the plant is taken internally, and the root, cut in small pieces or grated, is useful and acts most favorably in cases of dysentery or diarrhoea.

Facts About Lion’s Foot Plant

Name	Lion’s Foot Plant
Scientific Name	Nabalus serpentaria
Common/English Name	Prenanthes Serpens, Rattlesnake-Root, White Lettuce, Cancer Weed, Canker root, Rattlesnake root, White cankerweed
Plant Growth Habit	Perennial plant
Root	Branching, tuberous
Stem	1 to 2 meters tall, green or often purplish
Leaf	Smooth, thick, deep green
Medicinal parts	The whole plant
Flower	White or yellowish, 11-14 mm long

Lion’s Foot Plant Scientific Classification

Scientific Name: Nabalus serpentaria

Rank	Scientific Name & (Common Name)
Kingdom	Plantae (Plants)
Subkingdom	Tracheobionta ( Vascular plants)
Superdivision	Spermatophyta (Seed plants)
Division	Magnoliophyta (Flowering plants)
Class	Magnoliopsida (Dicotyledons)
Subclass	Asteridae
Order	Asterales
Family	Asteraceae ⁄ Compositae (Aster family)
Genus	Prenanthes L. (Rattlesnakeroot)
Species	Prenanthes serpentaria Pursh (Cankerweed)
Synonyms	Harpalyce rubicunda D.Don Harpalyce serpentaria (Pursh) D.Don Nabalus albus var. serpentaria (Pursh) Torr. Nabalus fraseri DC. Nabalus fraseri var. fraseri Nabalus fraseri var. integrifolius (Cass.) Torr. & A.Gray, 1842 Nabalus integrifolius Cass. Nabalus serpentarius var. integrifolius (Cass.) Britton, 1898 Nabalus serpentarius var. laevis DC., 1838 Nabalus serpentarius var. serpentarius Nabalus trilobatus Cass. Narbalia latifolia Rafin. Prenanthes alba Walt. Prenanthes alba var. serpentaria (Pursh) Torr. Prenanthes crepidinea Elliott Prenanthes fraseri D.Dietr. Prenanthes integrifolia (Cass.) Small Prenanthes serpentaria Pursh Prenanthes serpentaria f. serpentaria Prenanthes serpentaria var. serpentaria

Dose

1 teaspoonful of the granulated root steeped in 1 cup boiling water. Drink cold 1 cupful during the day, a large mouthful at a time. Of the tincture, 10–20 min.

Externally

In case of snake bites, steep the leaves in boiling water and apply as a poultice.

Homeopathic Clinical

Tincture of whole fresh plant—Constipation, Ophthalmia.

Medicinal uses

Root decoction is used for treating canker sores, dysentery, and diarrhea.
Drink milky juice to cure snake bites.
A poultice made from leaves is used as first aid for a snake, insect, and dog bites.
Native Americans put the powdered root in food for stimulating milk flow after childbirth.
Apply the leaves steeped in water to the wound and change it frequently.
Root decoction is used for treating rattlesnake bites and dysentery.

References

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

Write when the problem started and how it changed.
Bring old prescriptions, investigation reports, and current medicines.
Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

What is the most likely cause of my symptoms?
Which danger signs mean I should go to hospital quickly?
Which tests are necessary now, and which can wait?
How should I take medicines safely and what side effects should I watch for?
When should I come for follow-up?

Tests to discuss

Vital signs: temperature, pulse, blood pressure, oxygen saturation
Basic physical examination by a clinician
CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

Use oral rehydration solution and safe fluids to prevent dehydration.
Continue safe, light food as tolerated.
Seek care for children, older adults, pregnancy, or chronic illness.

OTC medicine safety

ORS is usually safer than unnecessary antibiotics for simple watery diarrhea.
Do not use anti-diarrhea stopping medicines if there is blood in stool or high fever unless a doctor advises.

Avoid these mistakes

Do not start antibiotics without a proper medical decision.
Do not use steroid tablets or injections casually for quick relief.
Do not delay emergency care because of home remedies.

Get urgent help if

Blood in stool, severe dehydration, persistent vomiting, very low urine, or lethargy needs urgent care.

Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider

Tests to discuss with doctor

Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
Relevant blood, urine, imaging, or specialist tests only after clinical assessment

Questions to ask

What is the most likely cause of my symptoms?
Which warning signs mean I should go to emergency care?
Which tests are really needed now?
Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Go to emergency care if you notice:

Severe or rapidly worsening symptoms
Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration

Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.

Step 1
Check danger signs first

If danger signs are present, seek emergency care and do not wait for online information.
Step 2
Record the symptom story

Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.
Step 3
Visit a qualified clinician

A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.
Step 4
Do only useful tests

Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.
Step 5
Follow up and return early if worse

If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips

Take a written symptom diary and all previous prescriptions/test reports.
Do not hide medicines already taken, even herbal or over-the-counter medicines.
Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

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Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

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Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

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