Botanical Identification of Arjuna (Terminalia arjuna)

To identify Arjuna (Terminalia arjuna) accurately, examine its morphological characteristics, taxonomic classification, and diagnostic features.

Arjuna (Terminalia arjuna) Monograph

Scientific Classification

Arjuna, or Terminalia arjuna, is classified within the plant kingdom Plantae. It belongs to the division Magnoliophyta, class Eudicots, order Sapindales, family Combretaceae, genus Terminalia, and species Terminalia arjuna. This classification reflects its botanical relationship to other flowering plants and its position in the plant taxonomy system.

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

Botanical Nomenclature and Synonyms

Terminalia arjuna is the scientific name of Arjuna, first described by Robertus Carolus in 1790. It belongs to the family Combretaceae. Common names include Arjuna, Arjuna tree, and Indian kino. It is also known by regional names like Arjuna in Hindi and Arjuna in Tamil. Historically, it has been referred to as the "Tree of Life" in Ayurvedic texts.

Morphological Characteristics

Arjuna is a deciduous tree with a straight, cylindrical trunk and a rounded crown. Its root system is extensive and woody, providing stability. The leaves are alternate, simple, and elliptical with a smooth margin. The inflorescence is a panicle, bearing small, greenish-white flowers. The fruit is a drupe, enclosing a single seed.

Diagnostic Identification Features

Arjuna can be distinguished by its rough, dark brown bark with longitudinal fissures, elliptical leaves with serrated edges, and small, yellowish-green flowers. It also has woody, branched fruit capsules that split open to release three-winged seeds. These features help differentiate it from similar Terminalia species.

Natural Habitat and Geographic Distribution

Arjuna is native to the Indian subcontinent, particularly India, Nepal, and Bhutan. It thrives in tropical and subtropical climates with high humidity. It prefers well-drained, loamy soils and is commonly found at altitudes between 300 and 1,500 meters.

Phenology and Growth Cycle

Arjuna blooms during the monsoon season, typically between April and June. Seed formation occurs from September to November. Harvesting is primarily done from December to February, when the bark is most mature and contains the highest concentration of active compounds.

Phylogenetic Relationships

Terminalia arjuna belongs to the genus Terminalia within the family Combretaceae. Its closest relatives include species like Terminalia bellerica and Terminalia tomentosa. These species share similar morphological and genetic traits, reflecting their close phylogenetic relationship within the genus.