Prota 11(1): Medicinal plants/Plantes médicinales 1
Sp. pl. 1: 3 (1753).
n = 52
Creeping spiderling (En). Trevinha (Po). Mkwayakwaya (Sw).
Origin and geographic distribution
Boerhavia repens has a pantropical distribution, and possibly originates from the Old World. It occurs throughout Africa, including the Mediterranean countries and South Africa, and is especially common in regions with a distinct dry season.
Boerhavia repens is considered to have similar properties to Boerhavia diffusa L., and the root is applied in India especially as a diuretic, but also as a stomachic, cardiotonic, hepatoprotective, laxative, anthelmintic, febrifuge, expectorant and, in higher doses, as an emetic and purgative. In West Africa decoctions of the roots and leaves of Boerhavia repens are taken in moderate doses to cure asthma, and in larger doses as an emetic, diuretic and laxative and to cure leprosy and syphilis. The roots are boiled and applied as a poultice to cure ulcers, including those resulting from Guinea worm infections, while ground roots are applied to yaws. The ground roots mixed with ground seeds of Blighia sapida K.D.Koenig are applied to the body to cure chicken pox. An infusion of the whole plant is taken to cure convulsions and amenorrhoea. The Yoruba people of Nigeria give an infusion as a mild laxative and febrifuge to children. The pounded plant is applied externally against dropsy. An infusion of the leaves is taken as an abortifacient, ecbolic and to cure jaundice, and the whole plant is pulped for poulticing sprains. In Central Africa a root decoction is taken as an aphrodisiac or to cure stomach-ache, while root sap is used as eye drops to treat filaria infection. In Nigeria Boerhavia repens is preferred over Boerhavia diffusa and Boerhavia erecta L. because it is considered the most effective.
In West Africa the leaves are sometimes prepared in a sauce as a vegetable, and the seeds are added to cereals or other food in Senegal and Mali. In Nigeria the root is added to cake and the Hausa people eat the plant as a cure for faintness due to hunger. The leafy stems are widely eaten by sheep and cattle, and may also be cut as a fodder.
Production and international trade
Boerhavia repens is used at a local scale, except in India where the plant enters into popular medicinal formulations, in the same way as Boerhavia diffusa and Boerhavia erecta.
All plant parts of Boerhavia repens contain flavonoid glycosides and the alkaloid punarnavine. A methanol extract of the entire plant inhibited bone resorption induced by parathyroid hormone in mouse bone tissue culture; some flavonoid glycosides were isolated as active compounds.
Annual to perennial, prostrate or straggling herb, with stems up to 60 cm long, with a slender taproot; stem few- to much-branched, fleshy, green, often flushed with red, finely hairy or glabrescent, nodes swollen. Leaves opposite, simple, unequal; stipules absent; petiole 0.5–1.5 cm long; blade broadly ovate to elliptical, 1–2.5 cm × 0.5–1.5 cm, base cuneate, rounded or truncate, apex rounded to acute, margins sinuate, pale green to whitish beneath, finely hairy, glandular hairy or glabrescent. Inflorescence an axillary, congested, irregular umbel or cyme, ( 3–)5–7(–13)-flowered; peduncle (2–)4–7 cm long; bracts and bracteoles small, fimbriate, caducous. Flowers bisexual, regular; pedicel (0–)1–1.5 mm long; perianth tubular-campanulate, distinctly constricted halfway, lower part ellipsoid, surrounding the ovary, 5-ribbed, green, upper part 5-lobed, up to 3.5 mm × 3 mm, lobes emarginate, white, pink or mauve, soon falling; stamens ( 1–)2(–3), slightly exserted; ovary superior, seemingly inferior, 1-celled, style slightly exserted, stigma head-shaped. Fruit an achene enclosed by the thickened lower part of perianth (collectively called anthocarp); anthocarp obovoid to ellipsoid, 3–3.5 mm × 1.5–2 mm, apex rounded, 5-ribbed, with rounded ribs, with glandular hairs all over, 1-seeded. Seed ovoid, pale brown. Seedling with epigeal germination.
Boerhavia comprises 5–20 species, depending on the species concept, and includes several variable pantropical weeds with complex nomenclatural histories.
In West Africa the leaf pulp of Boerhavia coccinea Mill., which is related to Boerhavia repens, mixed with peanut oil is burnt and the smoke inhaled to calm toothache. An infusion of the root is taken to treat liver problems. In Nigeria the roots are ground with other herbs and taken in water as a vermifuge. The leaves are sometimes cooked and eaten as a potherb. The nomads of the Sahara cook the protein-rich seeds in a soup.
Boerhavia repens can be found flowering and fruiting throughout the year, when sufficient water is available.
Boerhavia repens occurs in disturbed sandy and rocky localities, often in occasionally inundated areas, such as ditches along roadsides, dry river beds, flood plains and irrigated fields, up to 1600(–1900) m altitude. Boerhavia repens prefers sunny sites and a seasonal climate with a pronounced dry season.
The harvested parts of Boerhavia repens are often used fresh, except for the roots, which may be dried in the sun for later use.
Genetic resources and breeding
Boerhavia repens has a large area of distribution and occurs in disturbed habitats, and is therefore not at risk of genetic erosion.
Boerhavia repens has similar medicinal uses to its better-known relative Boerhavia diffusa, but more research is needed to elucidate its chemistry and pharmacological activities.
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Correct citation of this article:
Muzila, M., 2006. Boerhavia repens L. In: Schmelzer, G.H. & Gurib-Fakim, A. (Editors). Prota 11(1): Medicinal plants/Plantes médicinales 1. [CD-Rom]. PROTA, Wageningen, Netherlands.