Oregon yampah, eppaw, squaw potato

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

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For severe symptoms, danger signs, pregnancy, child illness, or sudden worsening, seek urgent medical care.

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Article Summary

Key Takeaways

This article explains Facts of Eppaw in simple medical language.
This article explains Eppaw 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.

Perideria is a genus of plants in the parsley family. The genus of this plant is known as yampa or yampah. Pappaw botanically known as Perideridia oregana, is a species of flowering plant belonging carrot family also known as Oregon yampah and squaw potato. It is inherent to California and Oregon in the western United States where it is found in woodland or another habitat. The appearance of plant is variable. Generally, it is a perennial herb that grows about 10 to 90 centimeters tall and the green to waxy-grayish stem grows from a cluster of small tubers. Leaves near plant base have 3-30 centimeters long blades divided into a various number of leaflets that are subdivided into smaller segments. An inflorescence is a compound umbel of various spherical clusters of white small flowers. Flowers are followed by ribbed and oblong shaped fruits measuring 3 to 6 millimeters long. It is common in Oregon, Northern California and Washington. This species have variable leaves usually resembling thread with little branching in leaflets.

Facts of Eppaw

Name	Eppaw
Scientific Name	Perideridia oregana
Native	Oregon and California in the western United States
Common/English Name	Oregon yampah, eppaw, squaw potato
Plant Growth Habit	Perennial herb
Plant Size	10 to 90 centimeters tall
Soil	Light (sandy), medium (loamy) and heavy (clay)
Stem	Green to waxy-grayish erect
Leaves	Triangular to ovate, 1 to 12 in. (3-30 cm) long
Flower	White, rounded petals
Flowering season	Summer (July to August)
Fruit shape & size	Oblong, 1/8 to ¼ in. (3-6 mm) long, 1/16 in. (1.5-2 mm) broad
Taste	Nutty
Major Nutritions	Manganese, Mn 1.094 mg (47.57%) Copper, Cu 0.234 mg (26.00%) Carbohydrate 31.68 g (24.37%) Phosphorus, P 165 mg (23.57%) Vitamin B5 (Pantothenic acid) 1.172 mg (23.44%) Vitamin C (Ascorbic acid) 13 mg (14.44%) Iron, Fe 1.15 mg (14.38%) Vitamin B6 (Pyridoxine) 0.176 mg (13.54%) Calcium, Ca 110 mg (11.00%) Zinc, Zn 1.15 mg (10.45%)
Calories in 1 cup (100 g)	150 Kcal.

Eppaw Scientific Classification

Scientific Name: Perideridia oregana

Rank	Scientific Name & (Common Name)
Kingdom	Plantae (Plantes, Planta, Vegetal, plants)
Subkingdom	Viridiplantae
Infrakingdom	Streptophyta (Land plants)
Superdivision	Embryophyta
Division	Tracheophyta (Vascular plants, tracheophytes)
Class	Magnoliopsida
Order	Apiales
Family	Apiaceae
Genus	Perideridia Rchb. (Yampah)
Species	Perideridia oregana (S. Watson) Mathias (Squaw potato, Oregon yampah)
Synonyms	Carum oreganum S.Watson Edosmia oregana Nutt. ex Torr. & A.Gray

Description

Eppaw is a slender, perennial plant which grows 10 to 90 centimeters tall and is waxy to shining green. Plant arises from a cluster of two to six spindle shaped to spherical, chestnut-brown and tuberous roots. Basal leaf petiole is about ¾ to 4 inches (2-10 cm) long, sheathing throughout or to the middle. Leaves (basal) are triangular to ovate measuring 1 ½ to 5 ½ in. (4-14 cm) broad and 1 to 12 in. (3-30 cm) long. Leaves are pinnately dissected having leaflets further dissected into three narrow segments. Ultimate segments are ¼ in. (0.5-6 mm) broad and 3/16 to 2 3/8 in. (0.5-6 cm) long. The plant has 1-29 unequal rays of flower clusters measuring 1 to 1 ½ in (2.5-4 cm) long. The clusters of flower contain 10 to 29 flowers having toothed leafy bracts beneath. Petals are white, rounded, about 1/16 inches (1 to 1.5 mm) long and broad with a single vein. Fruit is oblong measuring 1/16 in. (1.5-2 mm) broad, 1/8 to ¼ in. (3-6 mm) long with threadlike ribs.

Habitat

Perideridia oregano is found in prairies, oak woodlands, moist or dry meadows and is found at an elevation of 380 feet (100 meters) in Washington.

How to eat

Roots are dried for later use.
Consume the roots raw or cooked.
It could be fried, boiled or roasted.

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

Rest, drink safe water, and observe symptoms carefully.
Keep a written note of symptoms, duration, temperature, medicines already taken, and allergy history.
Seek medical care quickly if symptoms are severe, worsening, or unusual for the patient.

OTC medicine safety

For mild pain or fever, ask a registered pharmacist or doctor before using common over-the-counter pain/fever medicines.
Do not combine multiple pain medicines without advice, especially if you have kidney disease, liver disease, stomach ulcer, asthma, pregnancy, or take blood thinners.
Do not give adult medicines to children unless a qualified clinician advises it.

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

Severe symptoms, confusion, fainting, breathing difficulty, chest pain, severe dehydration, or sudden weakness need urgent medical 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

Ask a health question safely

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.

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.