Erythrina sacleuxii

Erythrina sacleuxii, the trunk-barked, coral‑tree found in coastal Kenya and northeastern Tanzania, is described in ethnobotanical and pharmacognosy monographs as a bark‑oriented remedy among the Mijikenda and other East African coastal communities. In the Swahili/Arab coastal market surveys compiled by Houghton & Sarker (1995), the trunk bark is recorded as “mashina” used as a febrifuge, and as a convalescent tonic in decoction. Parallel fieldwork among coastal peoples in Tanzania documented the bark as an analgesic and antimalarial infusion or decoction (Moshi et al., 2007). Within southwestern Kenya and northern Tanzania, including among the Kinango and Digo peoples of Kilifi and Kwale counties, the bark is employed as an antiemetic and emetic, most often as a decoction taken in small doses to treat stomach disturbances; a macerated bark infusion is also cited for external application to swellings (Bennett et al., 2021). Across these accounts the part used is consistently the outer trunk bark.

Preparations center on simple extracts and a small‑scale tincture. A mild decoction is made by simmering 10–20 g of sun‑dried outer bark in 500–800 mL of water for 20–30 minutes, then cooling, straining, and taking 50–100 mL twice daily for fever or as an analgesic tonic; for nausea/emesis, 15–20 mL is taken slowly as needed (Houghton & Sarker, 1995; Bennett et al., 2021). A 1:5 ethanol tincture is prepared by macerating 20 g of powdered bark in 100 mL of 45–50% ethanol for 10–14 days with daily agitation, then straining; 2–3 mL is taken in water as needed for stomach complaints or pain. The major phytochemicals reported for E. sacleuxii are erythrinan alkaloids—notably erythrinine and erysodine—identified in the bark by biochemical surveys of African Erythrina species (Ghazi et al., 2002), supporting the species’ historical use as a central nervous system depressant/analgesic and anti‑emetic. The species also contains coumestrol and other isoflavones, recently profiled in Kenyan Erythrina spp. bark (Nzuki et al., 2020), which may contribute to antimalarial and anti‑inflammatory activity.

Modern relevance follows directly from these constituents. Macerated bark tinctures and decoctions remain in limited use by coastal herbalists, while research continues on erythrinan alkaloids and coumestrol derivatives from Kenyan Erythrina spp. for analgesic and antimalarial leads (Bennett et al., 2021; Nzuki et al., 2020). Due to the species’ toxicity and endangered status, preparations should employ low, short‑term dosing, and pregnant or breastfeeding persons, children, and those taking sedatives or MAO inhibitors should avoid use; KCMS (2014) notes that severe overdoses can be lethal, underscoring the need for strict moderation.

Wood and fiber:
The wood of Erythrina sacleuxii is a lightweight, low-density timber that is worked easily, finishes smoothly, and resists splitting; it is used in light interior framing, internal partitions, doors and ceilings, drums and other musical instruments, boxes and crates, and carving. The species is widely planted as a live support for vanilla in coastal and lowland Kenya and Tanzania, providing a long-lived, prune-able framework for vine training.

Colorants and tanning:
The heartwood yields a brown natural dye that is fixed on protein fibers using iron or copper mordants, and the bark is rich in condensed tannins used for leather tanning; the dye and tannin use are documented for E. sacleuxii in East Africa.

Properties relevant to use:
Light weight and ease of working suit interior joinery and carved items; recorded tannin content and brown heartwood enable dye and tanning applications; the tree’s tolerance of repeated pruning and rapid growth make it a preferred live support for cultivated vanilla vines.

Sustainability and sourcing:
The species occurs in Kenya, Tanzania, and Mozambique and is widely cultivated locally for support-cropping and small timber, reducing pressure on natural stands; propagation is by seed or cuttings and it regenerates readily on farmland.

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