Botanical Identification of Ceylon Cassia (Cassia angustifolia)

To identify Ceylon Cassia (Cassia angustifolia) accurately, examine its morphological characteristics, taxonomic classification, and diagnostic features.

Ceylon Cassia (Cassia angustifolia) Monograph

Scientific Classification

Ceylon Cassia, or Cassia angustifolia, belongs to the kingdom Plantae, division Magnoliophyta, class Fabales, order Fabales, family Fabaceae, genus Cassia, and species Cassia angustifolia. It is a member of the legume family and is known for its medicinal properties in herbal medicine.

The following table shows the full taxonomy of this medicinal plant.

Botanical Nomenclature and Synonyms

Cassia angustifolia is the scientific name for Ceylon Cassia. It was first described by the botanist Carl von Linné, and its author citation is Linnaeus. The species has several synonyms, including Senna angustifolia and Acacia angustifolia. It is also known by various common and regional names, reflecting its widespread use in traditional herbal medicine.

Morphological Characteristics

Ceylon Cassia is a deciduous shrub or small tree with a taproot system. Its stems are straight, often branching, and covered with rough, ridged bark. Leaves are pinnately compound, with 7-13 pairs of elliptic, hairy leaflets. Inflorescences are axillary clusters of bright yellow flowers. The fruit is a pod containing several kidney-shaped seeds.

Diagnostic Identification Features

Ceylon Cassia can be distinguished by its narrow, lance-shaped leaves with prominent veins, yellow flowers in clusters, and oblong pods containing flat, dark brown seeds. It differs from similar species like Cassia fistula by its leaf shape and smaller, more elongated pods.

Natural Habitat and Geographic Distribution

Ceylon Cassia is native to Sri Lanka and parts of South and Southeast Asia. It thrives in tropical climates with high humidity and warm temperatures. It prefers well-drained, loamy soils and is commonly found at altitudes between 500 and 1,500 meters.

Phenology and Growth Cycle

Ceylon Cassia typically blooms from March to May. Seed formation occurs from June to August. For identification purposes, the best time to harvest is during the early stages of seed development, when the pods are still green and the seeds are visible but not yet fully mature.

Phylogenetic Relationships

Ceylon Cassia (Cassia angustifolia) is closely related to other Cassia species within the legume family. It shares key morphological traits with its genus, such as compound leaves and pods. Its phylogenetic position reflects its close ties to other Cassia species, which are part of the broader legume family, Fabaceae.