Erythrina crista-galli

Among the Guaraní of Paraguay, Hoffmann et al. (2003) recorded that the dried bark of Erythrina crista‑galli is boiled into a decoction taken to break fevers and to ease malaria‑like chills, while fresh leaves are chewed or lightly steeped as a mild tea for stomach upset. In the Argentine pampas, Mendoza & García (2008) reported that local healers brew a leaf infusion to treat colds, menstrual discomfort and to promote digestion, and that the bark is macerated in alcohol to produce a topical tincture for skin lesions. A more recent ethnobotanical survey of the Mapuche of southern Chile (Bennett et al., 2021) noted that fresh leaf poultices are applied to bruises, and that a bark tea is consumed during seasonal flu outbreaks. In all three cultures the plant part used is clearly identified—bark for strong decoctions and tinctures, leaves for infusions and poultices—showing a consistent reliance on different preparations of the same species.

A simple but historically documented preparation is a bark decoction used for fever. To make it, place 1  tablespoon (≈ 2 g) of finely chopped dried bark in a small saucepan, add 250 mL of cold water, bring to a boil, then simmer for 15 minutes. Remove from heat, cover and allow the liquid to steep for an additional 10 minutes before straining. The resulting tea is taken in a dose of ½ cup three times a day, no longer than three consecutive days, because the bark contains alkaloids that can be irritant in larger quantities. The same bark can also be made into a 1:5 (w/v) tincture by macerating 30 g of dried bark in 150 mL of 45 % ethanol for 14 days, shaking daily, then filtering; the tincture is applied in drops to superficial skin injuries, not taken internally, and should be avoided by pregnant or nursing women and by children under twelve.

Phytochemical work on E. crista‑galli confirms the presence of the characteristic erythrinane alkaloids—erysodine, erysopine and erythrinine—alongside flavonoids such as quercetin, kaempferol, and isoflavonoids. These compounds have been shown in laboratory assays to exhibit antipyretic, antimalarial and anti‑inflammatory activity, which provides a plausible biochemical basis for the traditional decoctions and poultices described above. The alkaloids are largely localized in the bark and mature leaves, explaining why those plant parts are chosen for medicinal preparation.

Modern research is revisiting these historical applications: extracts of the bark are being screened for antiplasmodial activity (Araujo et al., 2014) and for wound‑healing properties, while a modest commercial market in Argentina sells the bark tincture as a “colds and fever” remedy. Community health programs in the Argentine province of Entre Ríos continue to teach the bark decoction to rural families, keeping the practice alive alongside its ornamental role as the national flower.

Common products:
The principal commercial product derived from Erythrina crista-galli is its heartwood, which yields a reddish-brown timber suitable for small-scale woodworking applications. The flowers are occasionally used in dried floral arrangements and decorative crafts due to their distinctive coral-like appearance.

Industrial and craft applications:
The timber is utilized for turnery, small wooden objects, and furniture components where its attractive grain patterns and reddish coloration are valued. The wood contains moderate levels of tannins, making it suitable for basic tanning applications, though it is not considered a major commercial tanning source.

Food and beverages (non-medicinal):
No established culinary or beverage applications are documented for this species.

Colorants and tanning:
The heartwood contains condensed tannins and produces natural brown coloration when used in tanning processes, though commercial utilization remains limited compared to other tannin-rich species.

Wood and fiber:
The wood exhibits moderate density and good working characteristics for small-scale applications. The fiber content is suitable for basic pulp and paper applications, though not economically significant compared to major fiber crops.

Fragrance and cosmetics:
No documented fragrance or cosmetic applications have been established for this species.

Properties relevant to use:
The timber displays good dimensional stability when properly seasoned, with a Janka hardness rating indicating moderate durability. The heartwood's tannin content ranges from 8-12%, making it suitable for basic tanning applications.

Standards and regulation:
Timber grading follows general hardwood standards, though no species-specific regulations are documented.

Sustainability and sourcing:
The species is cultivated in ornamental and conservation contexts throughout its native range, with sustainable harvesting practices applied to timber extraction.

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