Apium nodiflorum, Helosciadium nodiflorum, European marshwort, Fool’s-water-cress

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 10 min read

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Article Summary

Key Takeaways

This article explains European Marshwort Facts in simple medical language.
This article explains European marshwort Scientific Classification in simple medical language.
This article explains Nutritional value of European marshwort in simple medical language.
This article explains Traditional uses and benefits of European Marshwort in simple medical language.

Educational health guideWritten for patient understanding and clinical awareness.

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Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

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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

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Apium nodiflorum synonym Helosciadium nodiflorum, commonly known as fool’s-watercress, is a flowering plant of the genus Apium and Apiaceae ⁄ Umbelliferae (Carrot family) found in ditches or streams of Western Europe. Its duration is perennial which means it will grow year after year. The plant is considered to be native of Western Europe and is found throughout the North Island and the north and west of the South Island of New Zealand. Apart from Fool’s watercress, it is also known as European marshwort, Fool’s-Watercress, Wild celery, Lebanese Cress, Poor Man’s Watercress, and Procumbent Marshwort. Apium is derived from the Latin Apis, for “bee”, nodiflorum means “flowering at the nodes”. Fool’s-watercress is not a poisonous plant, but it could be confused with the poisonous Lesser Water Parsnip – Berula erecta – which is poisonous. The main distinguishing feature is that Berula erecta has a distinct ring on the leaf stalk; however, caution recommends that a tasting would be better avoided. Lesser Water Parsnip also smells quite like parsnip when the leaves are crushed thus being given its common name.

European Marshwort Facts

Name	European Marshwort
Scientific Name	Apium nodiflorum (L.) Lag
Native	Western Europe and is found throughout the North Island and the north and west of the South Island of New Zealand
Common Names	European marshwort, Fool’s-water-cress, Wild celery, Procumbent Marshwort, Lebanese Cress, Poor Man’s Watercress
Name in Other Languages	Catalan: Api bord, Api d’aigua, Api de síquia, Creixen bord, Creixen de bou, Créixens, Créixens bords, Galassa Dutch: Groot moerasscherm English: European marshwort, Fool’s-water-cress, Wild celery, Procumbent Marshwort, Lebanese Cress, Poor Man’s Watercress French: Ache faux-cresson, Ache Nodiflore, Céleri à fleurs nodales German: Knotenblütiger Scheiberich, Knotenblütiger Sellerie Hebrew: כרפס הביצות Irish: Gunna uisce Italian: Sedano d’acqua Maltese: Karfus tal-ilma Polish: Selery wezlobaldachowe Spanish: Apio bastardo, Berraza, Berrera, Berrios Welsh: Dyfrforonen swp-flodeuog, Dyfrforonen Sypflodeuog Western Frysian: Grut feanskerm
Plant Growth Habit	Low-growing or prostrate perennial, flowering plant
Growing Climates	Wetland habitats such as the margins of rivers, streams, lakes, ponds, canals and ditches as well as in marshy grassland and anthropogenic habitats such as gravel pits
Soil	Prefers a nutrient-rich, neutral soils as well as margins of the river, lakes and ponds
Plant Size	About 30 cm to 1 meter tall
Stem	Prostrate and ascending stems. They are smooth, round, hollow, finely furrowed
Leaf	Glossy, bright green to 70 cm long with 2 to 8 pairs of toothed stalk less oval to lance-shaped leaflets
Flowering season	July and August
Flower	Individual flowers are small (2 to 2 mm) with five white petals, and occur in short stalked clusters/umbels (2 to 4 cm) in diameter
Fruit Shape & Size	Small (2mm long) and ovoid/egg shaped and ribbed
Fruit Color	Dark brown
Flavor/Aroma	Strongly of carrot
Taste	Carrot
Major Nutrition	Vitamin B9 (Folate) (125 µg) (31.25%) Iron, Fe 1.8 mg (22.50%) Vitamin E (alpha-tocopherol) (2.59 mg) (17.27%) Sodium, Na (244 mg) (16.27%) Calcium, Ca (152 mg) (15.20%) Manganese, Mn (0.29 mg) (12.61%) Vitamin C (Ascorbic acid) 9.11 mg (10.12%) Copper, Cu (0.08 mg) (8.89%) Total dietary Fiber (2.7 g) (7.11%) Magnesium, Mg (28 mg) (6.67%)
Precautions	As this plant grows in waterways, it must be cooked to remove the risk from waterborne parasites, such as liver fluke.
Other facts	Fresh aerial parts were used as animal feed for pigs and partridges and in ethnoveterinary science.

European marshwort Scientific Classification

Scientific Name: Apium nodiflorum (L.) Lag

Rank	Scientific Name & (Common Name)
Kingdom	Plantae (Plants)
Subkingdom	Tracheobionta (Vascular plants)
Infrakingdom	Streptophyta (land plants)
Superdivision	Spermatophyta (Seed plants)
Division	Magnoliophyta (Flowering plants)
Subdivision	Spermatophytina (spermatophytes, seed plants, phanérogames)
Class	Magnoliopsida (Dicotyledons)
Subclass	Rosidae
Superorder	Asteranae
Order	Apiales
Family	Apiaceae ⁄ Umbelliferae (Carrot family)
Genus	Apium L. (celery)
Species	Apium nodiflorum (L.) Lag. (European marshwort)
Synonyms	Apium nodiflorum var. vulgare H. Wolff Helodium nodiflorum (L.) Dumort Helosciadium hybridum Mérat ex F.W.Schultz Helosciadium intermedium Ten. ex Nyman Helosciadium nodiflorum (L.) Koch Helosciadium nodiflorum var. ochreatum Bab Helosciadium nodiflorum f. purpurascens Maire Helosciadium nodiflorum var. radiatum (Viv.) Coss Helosciadium nodiflorum var. repentiforme Rouy & E.G.Camus Helosciadium stoloniferum Nyman Lavera nodiflora (L.) Raf Meum nodiflorum (L.) Baill Pimpinella nodiflora (L.) Stokes Selinum nodiflorum (L.) E.H.L.Krause Seseli nodiflorum (L.) Scop Sison nodiflorum (L.) Brot Sium intermedium Ten Sium nodiflorum L Sium radiatum Viv Sium stoloniferum Guss Tordylium cyrenaicum Spreng

Plant Description

European Marshwort is actually a low-growing or prostrate perennial, flowering plant that grows about 30 cm to 1 meter tall. The plant is found growing in wetland habitats such as the margins of rivers, streams, lakes, ponds, canals and ditches as well as in marshy grassland and anthropogenic habitats such as gravel pits. The plant prefers nutrient-rich, neutral soils as well as margins of the river, lakes and ponds. The plant has prostrate and ascending stems. They are smooth, round, hollow and finely furrowed. Leaves are glossy; bright green about 70 cm long with 2 to 8 pairs of toothed stalk less oval to lance-shaped leaflets. Individual flowers are small (2 to 2 mm) with five white petals, and occur in short stalked clusters/umbels (2 to 4 cm) in diameter. Flowering takes place from July and August. Flowers are followed by fruit that are dark brown, small about 2 mm long and ovoid/egg shaped and ribbed.

History

This species has perhaps been consumed since antiquity, though it is difficult to find any clear references to it. For instance, some of the ancient mentions of the celery, a closely related species might be attributed to A. nodiflorum. This could be the case of some references found in Theophrastus or Dioscorides. In the sixteenth-century Spanish translation of the later work, Laguna, in the chapter of the watercress, describes another similar species supposed to be toxic and with the Castilian name of berrazas, the same registered in the recent ethno botanical works.

Nutritional value of European marshwort

Serving Size: 100 g

Calories 21 K cal. Calories from Fat 3.78 K cal.

Proximity	Amount	% DV
Water	92 g	N/D
Energy	21 Kcal	N/D
Protein	1.6 g	3.20%
Total Fat (lipid)	0.42 g	1.20%
Ash	1.7 g	N/D
Carbohydrate	1.2 g	0.92%
Total dietary Fiber	2.7 g	7.11%

Minerals	Amount	% DV
Calcium, Ca	152 mg	15.20%
Iron, Fe	1.8 mg	22.50%
Magnesium, Mg	28 mg	6.67%
Potassium, K	165 mg	3.51%
Sodium, Na	244 mg	16.27%
Zinc, Zn	0.5 mg	4.55%
Copper, Cu	0.08 mg	8.89%
Manganese, Mn	0.29 mg	12.61%

Vitamins	Amount	% DV
Water soluble Vitamins
Vitamin B9 (Folate)	125 µg	31.25%
Vitamin C (Ascorbic acid)	9.11 mg	10.12%
Vitamin C (Dehydroascorbic acid)	15 mg	N/D
Fat soluble Vitamins
Vitamin E (alpha-tocopherol)	2.59 mg	17.27%
Tocopherol, beta	0.25 mg	N/D
Tocopherol, gamma	0.21 mg	N/D

Organic acids	Amount	% DV
Oxalic acid	534 mg	N/D
Malic acid	72.7 mg	N/D
Citric acid	28 mg	N/D
Fumaric acid	1.37 mg	N/D
Phenolics (total)	80.5 mg	N/D
Flavonoids	45.5 mg	N/D

Lipids	Amount	% DV
Fatty acids, total saturated	23.6 g	N/D
Myristic acid 14:00(Tetradecanoic acid)	0.69 g	N/D
Palmitic acid 16:00 (Hexadecanoic acid)	16.3 g	N/D
Stearic acid 18:00 (Octadecanoic acid)	1.77 g	N/D
Arachidic acid 20:00 (Eicosanoic acid)	0.34 g	N/D
Behenic acid (docosanoic acid) 22:00	1.22 g	N/D
Lignoceric acid (tetracosanoic acid) 24:00	2.07 g	N/D
Fatty acids, total monounsaturated	4.7 g	N/D
Palmitoleic acid 16:1 (hexadecenoic acid)	1.1 g	N/D
Oleic acid 18:1 (octadecenoic acid)	3.33 g	N/D
Fatty acids, total polyunsaturated	71.7 g	N/D
Linoleic acid 18:2 (octadecadienoic acid)	24.6 g	N/D
Linolenic acid 18:3 (Octadecatrienoic acid)	43.5 g	N/D
n − 3	45.8 g	N/D
n − 6	25.9 g	N/D
n − 9	4.7 g	N/D

Above mentioned Percent Daily Values (%DVs) are based on 2,000 calorie diet intake. Daily values (DVs) may be different depending upon your daily calorie needs. Mentioned values are recommended by a U.S. Department of Agriculture. They are not rxharun.com recommendations. Calculations are based on average age of 19 to 50 years and weighs 194 lbs. Source:

https://www.springer.com/

Traditional uses and benefits of European Marshwort

Its tender aerial parts are considered digestive, intestinal infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।" data-rx-term="inflammation" data-rx-definition="Inflammation is the body’s response to injury, infection, or irritation, often causing pain, swelling, heat, or redness. সহজ বাংলা: শরীরের প্রদাহ; ব্যথা, ফোলা বা লালভাব হতে পারে।">inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।" data-rx-term="anti-inflammatory" data-rx-definition="Anti-inflammatory means reducing inflammation, pain, or swelling. সহজ বাংলা: প্রদাহ/ফোলা/ব্যথা কমায়।">anti-inflammatory, depurative, and employed to treat respiratory and urinary diseases.
Other supposed health benefits of A. nodiflorum include liver protection and bile production.
Decoction of the whole plant was topically employed to treat eczema in southern Spain.

Culinary Uses

This species has been traditionally consumed in the Mediterranean countries, at least in Portugal, Spain.
As other wild vegetables that grow in aquatic environments, A. nodiflorum is mainly consumed raw without any preparation or in green salads.
It is also cooked in different recipes, such as boiled with legumes, in omelets, as a turnover filling, as a dough stuffing, or included in the Moroccan beqoul, a mixture of several wild food plants used to prepare a springtime meatless dish—highly prized by rural people, especially in mountainous areas.
The fool’s watercress is also employed as a condiment to aromatize soups or other stews.
It can also be used to enhance the flour of spinach or other wilted greens.

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.

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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.