Family : Euphorbiaceae
Text © Pietro Puccio
English translation by Mario Beltramini
The plant is native to a vast area of tropical America (Aruba, Bahamas, Brazil, Colombia, Costa Rica, Cuba, Dominican Republic, Dutch Antilles, Ecuador, French Guyana, Guatemala, Guyana, Haiti, Honduras, Jamaica, Leeward Islands, Mexico, Nicaragua, Paraguay, Surinam, Trinidad and Tobago, Venezuelan Antilles, Venezuela and Windward Islands).
The name of the genus comes from the combination of the Greek words “iatrόs” = doctor and “trophé” = food, with reference to the medicinal properties ascribed to the species belonging to the genus; the name of the species is the combination of the name of the genus Gossypium (to which belong the species furnishing the cotton) with the Latin word “folium” = leaf, with reference to the resemblance of the shape of the leaves.
Common names: bellyache bush, black physicnut, cotton-leaf physic nut, figus nut, wild cassava (English); faux manioc, le lèpre, médicinier bâtard, médicinier noir, médecinier sauvage, médecinier rouge, pourghère rugueuse (French); erva purgante, mamoninha, peão-roxo, pião-roxo, pinhão-roxo, raiz-de-tiu, piñón negro (Portuguese Brazil); higuereta cimarrona, piñón negro, purga delfraile, tautuba, túatúa (Spanish).
The Jatropha gossypiifolia L. (1753) is a perennial shrub with short life, evergreen, that acts as deciduous in the arid climates and outside from the tropical and subtropical zones, much ramified, tall up to about 3 m, but which usually does not exceed the 1,5 m.
The smooth and green bark tends to flake in thin grey layers; the lymph is of a pink orange to brownish colour.
The leaves, on a 6-12 cm long petiole equipped with glandular hairs, are alternate, 4-12 cm long and 4-16 cm broad, divided in 3 to 5 obovate to oblanceolate lobes, with a longer central lobe, sharp at the apex, and edges slightly indented, glabrous or provided with glandular hairs.
The new leaves have a showy, intense, purple red colour. The inflorescences are cymes carrying unisexual bright red flowers, of about 1 cm of diameter, the female ones are isolated at the apex of the main axes, the male ones are placed laterally, the flowering is practically continuous, but intensifies between late summer and early autumn.
The fruit is a dehiscent capsule (which opens spontaneously when ripe), with three lobes of about 1 cm of diameter and a length of 1,3 cm, of green colour tending to the brown when ripe, usually containing three 7-8 mm long, brown, ellipsoidal seeds.
It reproduces by seed which germinates in a few days; the species self-disseminates quite easily, so much to be considered as a dangerous pest, especially in the tropical zones.
Of great ornamental value, due to its glossy foliage, initially dark violet, then intense green, it is cultivable in full sun in the tropical, subtropical and marginally in the warm-temperate zones; brief drops in temperature around -3 °C cause damage to the aerial part; it may resist to long drought periods.
It grows up in whatever sort of soil, even sandy and stony, and tends to become a pest in perturbed soils. It may be cultivated in pot in a sandy loam with a very good drainage, in full sun or, anyway, at the maximum possible luminosity and watering when the upper layer of the loam is dry.
All the parts of the plant are considered as toxic, in particular the seeds as these contain the 40% in weight of oil; the major effects, in the most serious instances, are dehydration and cardiovascular failure, as consequence of hemorrhagic gastroenteritis. It has also dismal effects on the central nervous system.
The quantity of ingested seeds which may give toxic effects strongly depends on the personal response, from very few seeds to some tens, the children, of course, are the most exposed with the possibility of toxic effects also after the ingestion of one seed only, with abdominal pains and bloody diarrhoea.
The oil extracted from the seeds is a powerful emetic and cathartic and in spite of its irritant properties for the skin, it is utilized in several dermatitis, whilst the lymph is used for healing wounds due to its haemostatic properties; also the leaves and the bark do have purgative properties.
Various studies have been done, with promising results, about the anti-cancer properties and in other fields of the medicine of several substances extracted from the plant. Finally, the oil; which was once utilized in the lamps, might have an interesting utilization as bio-fuel.
Synonyms: Manihot gossypiifolia (L.) Crantz (1766); Adenoropium gossypiifolium (L.) Pohl (1826); Jatropha elegans Kl. (1853).
The photographic file of Giuseppe Mazza