Arsenic bush vs Coiled Cassia

Senna septemtrionalis compared with Senna circinnata

Key Differences

• Arsenic bush is Not Evaluated while Coiled Cassia is Least Concern.

Taxonomic Classification

Rank	Arsenic bush	Coiled Cassia
Kingdom same	Plantae (planta)	Plantae (planta)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order same	Fabales (Legumes & Allies)	Fabales (Legumes & Allies)
Family same	Fabaceae	Fabaceae
Genus same	Senna	Senna
Species	Senna septemtrionalis	Senna circinnata

Evolutionary Relationship

Arsenic bush and Coiled Cassia share a common ancestor at the Genus level: Senna.

Conservation Status

Arsenic bush

NE — Not Evaluated

Coiled Cassia

LC — Least Concern

Physical Characteristics

Attribute	Arsenic bush	Coiled Cassia
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arsenic bush

Habitat

Inhabits tropical and subtropical moist broadleaf forests and montane grasslands and shrublands within the Afrotropic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (19 countries), Asia (India, Japan, Timor-Leste), Europe (Portugal, United Kingdom), North America (7 countries), Oceania and the Pacific (Australia, Fiji, New Zealand), and South America (Brazil, Chile, Colombia).

Coiled Cassia

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Arsenic bush

The Arsenic bush, Senna septemtrionalis, is a species. Inhabits tropical and subtropical moist broadleaf forests and montane grasslands and shrublands within the Afrotropic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Coiled Cassia

The Coiled Cassia (Senna circinnata) is a shrubby legume in the family Fabaceae, native to inland arid and semi-arid regions of Australia, particularly the mulga woodlands and shrublands of Queensland, New South Wales, South Australia, and the Northern Territory. The common name 'coiled cassia' refers to the distinctive spirally coiled seed pods that develop after flowering—a morphological feature unique among Australian Senna species and immediately recognisable in the field. Plants typically grow 0.5–2 metres tall, with pinnate leaves and bright yellow flowers characteristic of the genus Senna. Like other acacias and legumes in arid Australian landscapes, Senna circinnata contributes to nitrogen fixation in nutrient-poor desert soils through root nodule symbiosis with rhizobia bacteria, benefiting the broader plant community. The species is drought-tolerant and well-adapted to the seasonal rainfall and thin soils of inland Australia, regenerating vigorously after fire and disturbance. It is assessed as Least Concern by the IUCN given its stable populations across a wide extent of occurrence within Australia's arid interior. Coiled Cassia provides browse for kangaroos and other herbivores and cover for small reptiles and birds in shrubland habitats.