Oncoba spinosa
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Oncoba spinosa Common Names: Snuff-Box Tree, Fried-Egg Tree, Spiny
Oncoba Scientific
Classification Kingdom: Plantae Clade: Tracheophytes Clade: Angiosperms Clade: Eudicots Order: Malpighiales Family: Salicaceae Genus: Oncoba Species: O. spinosa Authority: Forssk. Synonyms: Oncoba kraussiana Klotzsch, Oncoba monacantha (Schumach. & Thonn.) Steud., Lundia monacantha Schumach. & Thonn. Morphological Description Oncoba spinosa is
a deciduous shrub or small tree in the Salicaceae family, typically 3–6 m tall,
occasionally reaching 13 m in optimal conditions: · Stem: Armed with stout spines, 2–5 cm long, bark greyish-brown,
fissured with age (Burkill, 2000). · Leaves: Glossy, dark green, ovate to elliptic, 5–12 cm long, 3–7 cm
wide, with serrated margins (Fern, 2024). · Flowers: Large, 5–8 cm across, white with a bright yellow center,
fragrant, solitary or in small clusters, blooming May–July (Barwick, 2004). · Fruit: Globose, 4–6 cm in diameter, hard-shelled, green turning
brown, containing edible pulp and numerous seeds (Burkill, 2000). Distribution and Habitat Oncoba spinosa is
widely distributed across tropical and southern Africa and the southwestern
Arabian Peninsula: · Range: Senegal to South Africa, east to Kenya and Yemen; common in
Nigeria, Ghana, Zimbabwe (Fern, 2024). · Habitat: Riverine forests, savannas, bushveld, deciduous woodlands;
thrives in well-drained sandy or loamy soils, 20–35°C, 500–1,500 m altitude
(Burkill, 2000). Ethnopharmacology Oncoba spinosa (commonly
known as the snuff-box tree) is a medicinal plant with diverse therapeutic
properties. It is rich in flavonoids, alkaloids, tannins, and essential oils(Djouossi
et al., 2015)., which contribute to its antioxidant, antimicrobial,
antidiabetic, anti-inflammatory, and cytotoxic activities. Studies have shown
that extracts from its leaves and roots exhibit strong antioxidant effects,
helping to combat oxidative stress-related diseases. Its antimicrobial
properties make it effective against various bacterial and fungal infections.
The plant also demonstrates α-glucosidase and α-amylase inhibitory activities,
indicating potential in diabetes management by reducing blood sugar levels.
Additionally, Oncoba spinosa has
shown pancreatic lipase inhibitory effects, suggesting a role in obesity
control by limiting fat absorption. Some studies indicate its cytotoxic
activity against certain cancer cell lines, hinting at possible anticancer
applications. Traditional medicine uses the plant for treating wounds, fever,
gastrointestinal issues, and inflammatory conditions, making it a promising
candidate for pharmaceutical development. · Dysentery/Bladder Complaints: Root decoctions in Mali treat dysentery
and urinary issues. Burkill (2000) notes its use for bladder conditions. · Antimicrobial: Leaf extracts in Nigeria for wound infections. Kamanyi et
al. (2014) found compound 5 (MIC 8 µg/mL) active against Klebsiella pneumoniae. · Antioxidant: Leaves in Cameroon for oxidative stress. Djouossi et al.
(2015) confirmed DPPH scavenging activity in methanol extracts. · Diabetes: Leaf infusions in Nigeria for diabetes. Prasanth Kumar et
al. (2017) investigated the potential of Oncoba spinosa (OS) extracts to
inhibit enzymes associated with diabetes and obesity. The researchers prepared
successive extracts of OS roots using solvents such as petroleum ether,
chloroform, ethyl acetate, and 70% ethanol. Among these, the ethanolic extract
exhibited the highest inhibitory activity against pancreatic lipase in a
dose-dependent manner. Kinetic studies revealed that this extract exerted
mixed-type inhibition on both α-amylase and pancreatic lipase, while
demonstrating non-competitive inhibition against α-glucosidase. These findings
suggest that OS may reduce the intestinal absorption of carbohydrates and
lipids, indicating its potential as a therapeutic agent for managing diabetes
and obesity. · Epilepsy: Roots in Uganda for seizures. Tabuti et al. (2003) document
its traditional use. ⚠ Toxicity Profile: Unripe fruit pulp may cause gastrointestinal
irritation due to tannins. High-dose leaf extracts (>500 mg/kg) showed mild
hemolytic effects on red blood cells in vitro (Djouossi et al., 2015). Additional Uses · Cultural: Hard fruit shells used as snuff-boxes, child rattles, and
dance anklets in Nigeria and Ghana (Burkill, 2000). · Edible: Fruit pulp consumed as a famine food in Zimbabwe; seeds
yield varnish oil (Fern, 2024). · Ornamental: Planted for its striking flowers in gardens; wood used for
small crafts (Barwick, 2004). References
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