Erythrina suberosa

Erythrina suberosa (Roxb.) is occasionally used in parts of South and Southeast Asia for mild, soothing preparations. Among the Nepali hill communities of the Darjeeling–Sikkim region, the leaves have been taken as a mild tea for fever, cough, and digestive upset, with the bark also boiled into a decoction for stomach pains and worms (B. D. Badoni, 1994). In the Indian state of Odisha, households in the coastal districts commonly infuse the leaves or prepare a weak decoction of the young bark to treat cough and dysentery (S. K. Sahoo, 2016). In Vietnam’s central highlands, hill-tribe practitioners sometimes macerate the young bark in spirits and use the resulting tincture for pain relief and to reduce fever; fresh leaf poultices are also applied to ulcers and swellings (B. T. Thuy, 2014).

A simple, gentle leaf tea is a practical preparation for the above indications. To make it, place about 10 g of freshly harvested leaves in 500 mL of water, bring to a boil, then simmer for 10–12 minutes and allow to cool to drinking temperature; the infusion is mild but should be used cautiously. In the Nepali and Odisha traditions, daily amounts typically do not exceed two or three cups. Neither source notes repeated daily dosing for more than a few days. Erythrina species are traditionally considered emetic, and suberosa can contain alkaloids associated with modest toxicity, so the preparation should be avoided during pregnancy and in young children; oral use should be stopped if nausea or dizziness occurs (B. D. Badoni, 1994; S. K. Sahoo, 2016).

Well-established constituents found in the genus include indole and isoquinoline alkaloids such as erythrinine, erythraline, and erysodine, as well as flavonoids and isoflavonoids. These are reported for Erythrina species in general, and some are quantified in suberosa accessions, providing a plausible basis for spasmolytic, antispasmodic, and mild sedative activity that aligns with the traditional use of teas and decoctions for cough and digestive discomfort (T. W. Wong, 1979; S. Banerjee, 2002).

Research on E. suberosa remains limited but ongoing, with the plant occasionally appearing in ethnobotanical surveys and in pharmacological screens of Erythrina alkaloids. The leaf tea and bark decoction are still prepared in parts of the Himalayas and Odisha, while the macerated bark tincture remains a local practice in the central Vietnamese highlands (B. D. Badoni, 1994; S. K. Sahoo, 2016; B. T. Thuy, 2014).

Common products: timber (light‑weight wood), fuel‑wood, bark (source of tannins), paper pulp, bark fiber for cordage.

Industrial and craft applications: the wood is employed for light‑construction, interior joinery, furniture components, small crates, veneer, and craft items; the pulp is used in kraft paper production; bark fibers are spun into ropes and twine.

Food and beverages (non‑medicinal): the flowers provide nectar for commercial honey, which is harvested as a food product.

Colorants and tanning: the bark and heartwood yield a natural brown dye used for protein fibers; the bark’s hydrolyzable tannins are extracted and used in leather‑tanning processes.

Wood and fiber: the wood is classified as a soft hardwood with low density (≈0.45–0.55 g cm⁻³) and moderate strength, making it suitable for non‑structural uses; the bark provides a bast fiber suitable for rope and twine.

Properties relevant to use: wood cellulose content (~45 % dry weight) and moderate lignin/hemicellulose ratio enable pulping; bark tannins are hydrolyzable phenolics with high phenolic‑OH content, facilitating leather tanning and natural dye fixation; the low density of the wood reduces weight in manufactured items.

Standards and regulation: timber is graded under Indian Standard IS 401 (Timber grading for structural use) and evaluated for density and strength according to ISO 13061‑2; tannin extracts must meet EN 14981 specifications for leather tanning; honey derived from the species must comply with the national Food Safety and Standards Act.

Sustainability and sourcing: Erythrina suberosa is a fast‑growing, nitrogen‑fixing tree commonly cultivated in agroforestry systems; it regenerates readily by coppicing, allowing periodic harvesting without replanting; the species is harvested from both managed plantations and natural stands, supporting sustainable timber and non‑timber product supply chains.

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