Broadleaf Mohlana (Mohlana latifolia)

Silhouette: T. Michael Keesey / License

Mohlana latifolia: Ethnobotany, Uses, and Morphology

Among the Maasai of East Africa, the soot-blackened stems of Mohlana latifolia have long been valued as a natural cosmetic for drawing elegant eyebrows. This resilient perennial herb, which often grows woody at the base, has traveled far from its native South American habitats to become naturalized across tropical Africa.

In various traditional cultures, Mohlana latifolia holds a dual reputation as both a potent medicinal resource and a potentially dangerous poison. While some communities caution against its toxic properties, others integrate its leaves and roots into complex local remedies.

Beyond its ethnobotanical value, the plant serves as a unique ecological indicator. Its presence is frequently used by local farmers to identify nutrient-rich soils that are highly suitable for establishing productive cocoa plantations.

Taxonomy

  • царство Plantae
  • division Tracheophytes (Vascular Plants)
  • subdivision Spermatophytes (Seed plants)
  • Angiosperms
  • mesangiosperms (Core angiosperms)
  • eudicots
  • Superasterids
  • order Caryophyllales
  • family Phytolaccaceae (Pokeweed family)
  • genus Mohlana (Mohl's berry)
  • species Mohlana latifolia (Broadleaf Mohlana)

Living Pulse

Morphology

Mohlana latifolia grows as a perennial herb or subshrub, typically reaching heights between 0.4 and 2 meters. The erect stems are often woody at the base and exhibit a slight angled structure with fine, bristly pubescence on the younger branches.

The foliage displays several distinctive botanical features:

  • Leaves: The leaf blades are ovate-elliptic to elliptic-oblong, measuring 4.5 to 15 cm in length and 2.0 to 6.5 cm in width. They feature a prominent acuminate apex and an unequal, broadly cuneate base, with primary lateral veins arranged in 6 to 10 pairs.
  • Calcium Oxalate Crystals: A unique diagnostic trait is the presence of styloid crystals visible on the lower leaf surface. Under magnification, these appear as short raised lines resembling appressed hairs.
  • Petioles: The leaf stalks range from 1 to 7 cm long and are characteristically pubescent along the upper channel.

The reproductive structures are arranged in slender racemes that extend up to 15 cm during the fruiting stage. The flowers are small, asymmetrical, and exhibit a white or pinkish coloration. The fruits are compressed-globose, 2 to 3 mm in diameter, turning from yellow or orange to a deep, purplish-black at maturity.

Applications

Despite reports of toxicity, Mohlana latifolia is widely utilized in African traditional medicine for various therapeutic purposes. The leaves are valued for their strong purgative and haemostatic (blood-stopping) properties.

Key applications in ethnobotany and local practices include:

  • Internal Remedies: Decoctions prepared from the leaves are administered to treat gastrointestinal disorders, colic, food poisoning, ascites, and respiratory symptoms such as coughing up blood.
  • External Treatments: A paste of crushed leaves is topically applied to alleviate severe headaches, rheumatism, skin infections, scabies, and swellings. The fresh leaf sap is also used as ear drops to combat localized infections.
  • Polyherbal Formulations: In Nigeria, the leaves serve as a key ingredient in popular commercial herbal tonics known as "nature cure bitters."
  • Agricultural Indicator: Farmers monitor the wild growth of this species, using it as a reliable indicator of rich, fertile soils ideal for establishing cocoa plantations.
  • Cultural Cosmetics: The Maasai people utilize the soot from the plant's blackened stems as a traditional cosmetic pencil to draw and define eyebrows.

Interesting facts

The dual nature of Mohlana latifolia makes it a subject of significant interest in ethnobotany. Here are some of the most remarkable facts about this species:

  • Toxic Contradictions: Ethnobotanical records contain highly contradictory information regarding the plant's safety. In some regions, the leaves are cooked and eaten as a vegetable or added to soups, while in other areas, the flowers and fruits are considered fatally poisonous to grazing livestock.
  • Anti-Parasitic Potential: Scientific investigations into the species have shown that crude extracts of the stem bark exhibit significant in vitro activity against the microfilariae and adults of Onchocerca volvulus, the parasitic worm responsible for causing river blindness in humans.
  • Microscopic Mimicry: The lower surface of the leaves contains specialized calcium oxalate crystals called styloids. These crystals form tiny, raised light-colored lines that closely mimic the appearance of appressed plant hairs, providing a unique microscopic fingerprint.

Geography of distribution

  • Argentina
  • Uruguay
  • Paraguay
  • Brazil
  • Bolivia
  • Peru
  • Ecuador
  • Colombia
  • Sri Lanka
  • Nigeria
  • Cameroon
  • Kenya
  • Tanzania
  • Madagascar

Technical Information

External Databases: GBIF, POWO, Tropicos

See also

True Araucarias

True Araucarias

Araucaria sect. Araucaria

Araucaria sect. Araucaria is a botanical section of evergreen conifers native to South America. It …