Description

Borassus aethiopum Mart., commonly known as the African fan palm, African palmyra palm, deleb palm, or ron palm, is a majestic species of palm in the family Arecaceae (the palm family) . The generic name Borassus is likely derived from an ancient name for this group of palms, while the specific epithet aethiopum refers to Africa (historically known as Aethiopia). The palm is widespread across much of tropical Africa, ranging from Senegal and Gambia in the west to Ethiopia in the east, and south to northern South Africa, though it is largely absent from the dense rainforests of Central Africa and desert regions such as the Sahara. It also grows in northwest Madagascar and the Comoros.

Morphology: The tree is a solitary, unbranched, evergreen palm, typically reaching heights of 10–25 meters (30–80 feet) and a trunk diameter of up to 1 meter at the base . In the floodplains of major East African rivers (such as the Rufiji in Tanzania and the Tana in Kenya), a remarkable form can reach up to 30 meters in height with a trunk thickness of up to 2.1 meters at breast height, making it arguably the most massive of all palms . Young palms are covered with persistent dry leaf stalks, showing gradually fading leaf scars. Trees over 25 years old develop a characteristic swelling of the trunk at 12–15 meters above the ground, at about two-thirds of the total height. The bark is pale grey in older palms and is more or less smooth.

Leaves: The leaves are very large, fan-shaped (palmate), and bluish-green, numbering 15–30 per crown. Each leaf measures up to 3.5 meters in length including the petiole (leaf stalk), and the leaf blade can be up to 3 meters wide. The petioles are armed with sharp, black thorns along the margins. The leaflets are symmetric at the base.

Flowers: The tree is dioecious, meaning male and female flowers are borne on separate trees . The flowers are yellowish. Male flowers are clustered in a branched, catkin-like spadix (inflorescence) measuring 0.8–1.8 meters in length. Female flowers are borne on an unbranched and shorter spadix, measuring 1.3–2.6 meters in length. The small male flowers are largely concealed within the scaly catkins, while the much larger female flowers reach up to 2 cm in width.

Fruit: The fruit is a large, ovoid drupe, approximately 15 cm in diameter, weighing around 500 grams each . It ripens from green to orange-yellow or brown. The fibrous, juicy pulp has a strong smell often described as similar to turpentine. Within the fruit are typically 1 to 3 large, hard seeds (kernels), each enclosed within a woody endocarp. The immature seed contains a sweet, refreshing juice similar to coconut water; as it matures, the liquid solidifies into a jelly-like substance and eventually becomes firm and nut-like.

Life Cycle and Growth: Three distinct phases of growth are recognized. The first phase takes 6–8 years and involves leaf development with very little upward growth, producing about 20 leaves in a wide crown. The second phase involves rapid growth of the trunk above the ground and takes place from the 8th to about the 20th year. The third phase involves flowering and the shedding of leaf stalks, during which the trunk becomes smooth and characteristic swellings appear. The palm can live for 60–140 years under favorable conditions.

 Common Names  

• English: African fan palm, African palmyra palm, Deleb palm, Ron palm, Toddy palm, Black rhun palm, Ethiopian Palmyra Palm, Fan Palm, Toddy Palm
• French: Palmier rônier, Rônier
• German: Äthiopische Palmyrapalme
• Dutch: Borassuspalm
• Arabic: Deleib, Delieb
• Hausa: Giginya
• Yoruba: Agbon Olode, Agbon 
• Igbo: Ubiri Nkwu  
• Fula/Fulani: Dubbe, Dubbi
• Tiv: (Specific name not documented in available sources)
• Nupe: Kpako
• Kanuri: Kurnu

Health Benefits

Borassus aethiopum is not only a vital food source across West Africa but also a highly valued traditional medicinal plant. A 2025 comprehensive review published in Planta Medica (Thieme Group) highlighted the palm’s emerging relevance to immunometabolic pharmacology, linking its phytochemistry to effects on oxidative stress and cytokine signalling. The review noted that “preparations derived from inflorescences, fruit pulp and kernels may exert antioxidant, anti-inflammatory and cardiometabolic effects”.

1. Anti-inflammatory and Immunomodulatory Properties: This is one of the most scientifically well-documented health benefits of B. aethiopum. The 2025 review detailed that the palm’s extracts may influence “cytokine-driven low-grade inflammation” through multi-target effects involving key cellular pathways.

Key mechanistic findings:

• NF-κB suppression and Nrf2 activation: The review identified that B. aethiopum modulates two critical pathways involved in inflammation and oxidative stress: the nuclear factor-kappa B (NF-κB) pathway (a master regulator of the inflammatory response) and the nuclear factor erythroid 2-related factor 2 (Nrf2) pathway (which controls the expression of antioxidant proteins).
• Cytokine modulation: The plant may influence cytokine networks implicated in metabolic and cardiovascular disorders, including C-Reactive Protein (CRP), a key marker of systemic inflammation.
• In vivo evidence: In rodent models, B. aethiopum preparations have been associated with reductions in oedema (swelling), nociception (pain sensation), and pyrexia (fever), often alongside lower C-Reactive Protein and oxidative stress markers .
• Antioxidant Properties: The palm is rich in various bioactive compounds, including polyphenols, flavonoids, terpenoids, sterols, saponins, and lipid fractions . These compounds are responsible for the plant’s ability to neutralize harmful free radicals and reduce oxidative stress, which is implicated in aging, cardiovascular disease, cancer, and various chronic inflammatory conditions.

The 2025 review confirmed that available non-clinical data indicate B. aethiopum preparations exert significant antioxidant effects.

• Antidiabetic and Cardiometabolic Benefits: Traditional medicine uses B. aethiopum for managing blood sugar, and modern research supports this application.

Key findings:

• In rodent models, B. aethiopum preparations have been associated with reductions in hyperglycaemia (high blood sugar) and dyslipidaemia (abnormal cholesterol/lipid levels) .
• Preliminary human studies using B. aethiopum-enriched bread in individuals at cardiometabolic risk have reported improvements in blood pressure (BP) and lipid profile, suggesting a possible effect on low-grade inflammatory status .
• Antimalarial (Antiplasmodial) Properties: Malaria is one of the primary conditions for which B. aethiopum is used in traditional medicine across Africa. A 2015 ethnopharmacological study published in the Journal of Ethnopharmacology documented the use of the palm against malaria in Ghana.

Key findings:

• A total of 37 use records were documented regarding the medicinal uses of B. aethiopum for the management of 24 different disorders. The highest medicinal use value was recorded for the use of B. aethiopum against malaria .
• Several root and leaf extracts displayed anti-plasmodial activity against the FCR3 strain of Plasmodium falciparum (the parasite responsible for the most dangerous form of malaria). The highest activity (78% inhibition at 50 μg/mL) was elicited by one of the dichloromethane root extracts.
• The study concluded that B. aethiopum is a “promising source of alternative medicines that could contribute to improving health conditions in malaria endemic areas of sub-Saharan Africa”.
• Rich Source of Dietary Fiber: The fruit pulp contains significant amounts of dietary fiber, which helps improve digestion, prevent constipation, promote healthy bowel movements, and support gut health
• Promotes Healthy Skin: The antioxidant and vitamin content may help maintain skin elasticity, support tissue repair, and reduce premature aging
• Supports Vision: The fruit contains carotenoids and other nutrients that contribute to eye health and normal vision.
• Antimicrobial Properties: The plant has demonstrated antimicrobial activity. The leaves are reportedly aphrodisiac, and the roots are used against stomach parasites. The roots are also used as a mouthwash and to treat bronchitis, sore throats, and asthma. The 2025 review noted that “major constituents, including polyphenols, terpenoids, sterols, saponins and lipid fractions” contribute to these pharmacological effects.
• Nutritional and Health-Promoting Properties of the Fruit: The fruit pulp is rich in oil and various nutrients. A detailed nutritional analysis of the fruit and seed composition is available.
• Chemical composition (dry weight):
  • Protein (crude): 2.8%
  • Fat: 0.5%
  • Ash (insoluble): 3.5%
  • Fibre (crude): 16.8%
• Amino acid profile (g (16g N)-1): Aspartic acid (9.3g), Glutamic acid (8.9g), Leucine (6.1g), Alanine (5.0g), Glycine (5.0g), Proline (5.0g), Valine (5.0g), Lysine (3.9g), Serine (3.9g), Isoleucine (3.6g), Phenylalanine (3.6g), Threonine (3.6g), Arginine (2.4g), Histidine (2.1g), Tyrosine (2.8g), Methionine (1.2g), Cysteine (0.1g)
• Mineral content (dry weight):
  • Iron: 488 mg/kg (exceptionally high)
  • Potassium: 0.09%
  • Magnesium: 0.10%
  • Calcium: 0.08%
  • Zinc: 4 mg/kg
  • Manganese: 8 mg/kg
  • Copper: 2 mg/kg
• Aphrodisiac and Tonic Properties: In several West African ethnobotanical practices, preparations made from the male flowers and root bark are taken as a invigorating physical tonic to alleviate fatigue and stimulate libido.
• Other Traditional Medicinal Uses: The palm has a wide range of applications in African ethnomedicine across different regions:
• Respiratory health: Roots are used to treat bronchitis, sore throats, and asthma . The flowers help against aphonia (loss of voice).
• Digestive health and parasites: Roots are used against stomach parasites. The plant is also used for various gastrointestinal disorders.
• Oral health: Roots are used as a mouthwash.
• Hemorrhage (Bleeding): Young leaves are used to stop haemorrhage.
• Aphrodisiac: Palm wine is a component of several aphrodisiac preparations in traditional medicine. The leaves are also reportedly aphrodisiac.
• Infertility: The hypocotyl (the young shoot emerging from the seed) is used in traditional herbal medicine for the treatment of infertility.
• Fever: Preparations have been associated with reductions in pyrexia (fever) in rodent models.

 Other benefits

• Timber and Construction: The wood is hard, moderately heavy, brown with black fibres, and is reputed to be termite-proof and resistant to decay. It is used for:
  • Posts for construction and bridges
  • Door frames, roof materials, and tool handles
  • Dugout canoes (in Mozambique)
  • Drums
  • Railway sleepers (where available)
• Leaf Products: The leaves have extensive practical applications:
  • Thatching: Mature leaves are used for roofing.
  • Weaving: Young leaves, before unfolding, can be split into strips and woven into thin mats, baskets, and other household objects.
  • Brooms: The leaf midribs are used to make brooms.
  • Fibre: The fibre extracted from the base of the leaf stalk has valuable qualities of resistance to chemicals, termites, and water. It is used for ropes, brushes, and as a sponge or filter when soaked.
  • Fish traps and nets: The leaf midribs are used to make these items.
• Palm Wine and Alcohol Production: The palm is particularly valued for its sap, which is tapped from the inflorescences (flower spikes). The sweet sap can be:
  • Consumed fresh as a refreshing beverage
  • Fermented to produce palm wine (also known as “toddy”), the traditional beverage of the Baoulé people of Côte d’Ivoire
  • Distilled to form a spirit such as “koutoukou”
  • Processed into vinegar
  • Used as a yeast source
• Firewood and Charcoal: The palm can be used as a source of firewood and for producing charcoal.
• Firebreak: The tree serves as an excellent firebreak, especially in the arid regions of West Africa that are prone to wildfires. Its ability to withstand fire makes it valuable for land management.
• Ornamental: B. aethiopum is an attractive palm with its tall, distinctive trunk and large, fan-shaped leaves. It has been planted for amenity purposes in parks and large gardens.
• Apiculture (Beehives): In Uganda, B. aethiopum trees are cut and hollowed out to make beehives.
• Fodder: Fruits and young leaves are sometimes browsed by livestock as fodder.
• Oil Production: Oil can be extracted from the fruit pulp.
• Environmental Conservation: The tree contributes to:
• Soil stabilization
• Prevention of erosion
• Habitat provision for wildlife
• Biodiversity conservation
• Economic Importance: The sale of fruits, sap, timber, crafts, and other products provides income for rural households.
• Cultural Significance: The palm plays important roles in:
• Traditional ceremonies
• Festivals
• Community livelihoods
• Indigenous knowledge systems

How it is used

Culinary uses (West African and broader context):

The palm is often called a “tree of life” because almost every part is edible or useful.

• Fruit:
• Fresh consumption: The ripe fruit pulp is eaten fresh or cooked, often with rice. It has a slightly sweet taste but with a mild turpentine-like flavour that may be an acquired taste.
• Flavouring porridge: The ripe, fallen fruit is peeled, and the juicy pulp is squeezed in water to form a solution that is added to porridge during cooking to improve flavour.
• Dried fruit: The fruit can be dried and stored for later consumption.
• Immature Seeds (Jelly Seeds):
• The immature seeds contain a sweet, translucent, jelly-like pulp that is highly prized and eaten as a refreshing snack, similar to the young seeds of the Asian palmyra palm. As the seed matures, the jelly solidifies, and the flavour becomes more nut-like.
• Seed Shoots (Germinated Seeds):
• Mature seeds can be buried in pits and allowed to germinate. The tender shoots that emerge are considered a delicacy. These are rich in starch and highly esteemed.
• Palm Cabbage (Apical Bud/Heart of Palm):
• The apical bud and young leaves are eaten raw or cooked, in salads or as a vegetable. However, eating the apical bud kills the palm, as it cannot produce side shoots. This practice is therefore highly destructive and generally discouraged for sustainable use.
• Seedlings:
• Young seedlings (the tuberous portion of the first juvenile leaves) are eaten as a vegetable, similar to asparagus. They are highly esteemed.
• Palm Sap (Palm Wine):
• The sap is extracted from the stem or inflorescences. A cut is made, and the dripping sap is collected in a receptacle. The sap is rich in sugars and can be:
• Consumed fresh as a sweet, refreshing drink
• Allowed to ferment naturally into palm wine (toddy)
• Distilled into a stronger spirit
• Processed into vinegar or concentrated for sugar extraction

Destructive harvesting note: For palm wine tapping, the terminal bud is sometimes cut, and the cut is renewed twice daily for 3-4 weeks until the tree is exhausted and dies. During this period, a single tree can yield about 200-500 litres of sap. Overtapping has made the tree rare in some areas, so sustainable tapping methods are essential.

Construction Uses: The trunk is processed into Beams, Posts, Building supports, and Rural housing materials

Craft Production: Leaves and fibers are woven into Baskets, Mats, Roof thatch, and Decorative items

Traditional medicinal uses (Africa):

Condition	Plant Part Used	Preparation Method
Malaria	Roots, leaves	Decoction (boiled in water), taken orally
Inflammation, pain, fever	Inflorescences, fruit pulp, kernels	Various preparations; extracts reduce oedema and fever
Diabetes, high blood pressure, high cholesterol	Fruit pulp, inflorescences	Dietary inclusion; enriched bread studied in human trials
Stomach parasites, digestive issues	Roots	Decoction taken orally
Bronchitis, sore throat, asthma	Roots	Decoction taken orally
Haemorrhage (bleeding)	Young leaves	Applied topically or taken orally
Infertility	Hypocotyl (young shoot)	Traditional preparation
Aphrodisiac	Palm wine	Consumed as part of traditional preparations
Oral health (mouthwash)	Roots	Decoction used as mouthwash

Side Effects / Caution

1. General Safety Profile (Highly Favorable): Multiple rigorous toxicity studies have demonstrated that Borassus aethiopum has an excellent safety profile with very low toxicity, confirming its safety for both nutritional and traditional medicinal use.

Acute Oral Toxicity (LD50):

• A 2022 sub-acute toxicity study determined that the oral median lethal dose (LD50) of the methanol hypocotyl extract is greater than 5000 mg/kg body weight in rats .
• An LD50 greater than 5000 mg/kg classifies a substance as practically non-toxic according to globally harmonized standards. This is a remarkably high safety margin.

Sub-acute/Sub-chronic Toxicity (28-day study):

• No mortality was recorded in rats after 28 days of daily treatment with the extract at doses of 250, 500, and 1000 mg/kg .
• With sub-chronic administration, no adverse toxicological effect was observed.
• There was no significant difference observed in hematological indices, liver function parameters, or kidney function parameters between the control group and extract-treated groups .

Conclusion from the study: The present study shows that the methanol hypocotyl extract of Borassus aethiopum is “pre-clinically safe in Wistar rats at the doses tested and may not likely produce any toxic effect on prolonged administration” .

• Lack of Data on Specific Populations (Pregnancy and Lactation): While the safety profile is generally favorable, there is limited specific data on the use of high-dose, concentrated medicinal extracts during pregnancy and breastfeeding.
• Normal dietary consumption of the fruit, immature seeds, and sap as food is generally considered safe based on traditional use across generations.
• Medicinal use (concentrated extracts, high-dose decoctions) during pregnancy and lactation should be approached with caution or avoided unless under professional supervision.
• Drug Interactions: Given the plant’s documented antidiabetic, antihypertensive, and anti-inflammatory properties:
• Antidiabetic medications: May have additive blood sugar-lowering effects. Individuals on diabetes medications should monitor their blood glucose levels when consuming the plant therapeutically.
• Antihypertensive medications: May have additive blood pressure-lowering effects.
• Anticoagulant (blood-thinning) medications: The anti-inflammatory compounds and potential effects on platelet function could theoretically interact with blood thinners.
• Immunosuppressant medications: The plant’s immunomodulatory effects (modulating cytokine pathways) could potentially interact with immunosuppressive drugs.
• Alcohol Content in Palm Wine: Palm wine is an alcoholic beverage. It should be:
• Avoided in children, pregnant women, and individuals with alcohol sensitivity or liver disease.
• Consumed in moderation by adults.
• Destructive Harvesting and Conservation Concerns:
• Overtapping of the palm for its sap (palm wine) has made the tree rare in some areas of its range .
• The destructive harvesting method that involves cutting the terminal bud leads to the eventual death of the tree and is not sustainable.
• When purchasing or using palm products, consider the sustainability of the source.
• Allergic Reactions: As with any plant, rare allergic reactions are possible in sensitive individuals. Those with known allergies to other members of the Arecaceae (palm family) should exercise caution when using B. aethiopum for the first time.
• Turpentine Flavour and Digestibility: The fruit pulp has a strong smell and flavour often described as turpentine-like. While this is not harmful, some individuals may find it unpleasant or experience mild digestive discomfort if not accustomed to it. Cooking or combining with rice may improve palatability.
• Hygiene Concerns: Improperly processed palm sap may become contaminated with microorganisms that can cause illness.
• Moderation: As with any food or herbal medicine, moderation is recommended. The traditional uses involve specific dosages and preparation methods. Excessive consumption, particularly of concentrated extracts or alcoholic preparations, should be avoided.

 References (MLA format)

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