Source: TNIE
Context:
Tamil Nadu has launched one of India’s largest invasive-species eradication initiatives aimed at completely removing Senna spectabilis from all forest divisions by March 2026. The drive targets restoration of forest biodiversity and ecosystem health.
About Senna spectabilis
- What It Is:
- A fast-growing, yellow-flowering tree from the legume family (Fabaceae). Widely planted as an ornamental or shade tree but now considered a highly invasive alien species in India, Africa, and parts of Asia.
- Origin:
- Native to South & Central America – Brazil, Argentina, Paraguay, Bolivia, Peru, Venezuela.
In India, invasive in Nilgiris, Mudumalai, Sathyamangalam, Anaikatty, and other Western Ghats ecosystems.
- Native to South & Central America – Brazil, Argentina, Paraguay, Bolivia, Peru, Venezuela.
- Habitat:
- Thrives in dry to moist deciduous forests, disturbed woodlands, and savannahs.
Prefers full sunlight, adapts to poor soils, and spreads easily through prolific seeds.
- Thrives in dry to moist deciduous forests, disturbed woodlands, and savannahs.
- Key Characteristics:
- Height: 7–18 m, forming dense canopies
- Bright yellow flowers and long pods (15–30 cm) with hard-coated seeds
- Leaves exhibit nyctinasty – close at night, open at dawn
- Traditionally used for fuelwood, shade, ornamental planting, and small implements
- IUCN Status: Least Concern
Ecological Implications
- Forms dense monocultures, suppressing native vegetation and reducing biodiversity.
- Reduces fodder availability for elephants, deer, and herbivores, impacting wildlife movement.
- Increases forest fire risk due to accumulation of dry biomass.
- Delays natural forest regeneration, threatening long-term ecosystem resilience.
