Botanical Identification of Quebracho Blanco (Aspidosperma quebracho-blanco)

To identify Quebracho Blanco (Aspidosperma quebracho-blanco) accurately, examine its morphological characteristics, taxonomic classification, and diagnostic features.

Quebracho Blanco (Aspidosperma quebracho-blanco) Monograph

Scientific Classification

Quebracho Blanco, scientifically known as Aspidosperma quebracho-blanco, belongs to the kingdom Plantae, division Magnoliophyta, class Liliopsida, order Apocynales, family Apocynaceae, genus Aspidosperma, and species Aspidosperma quebracho-blanco. This classification places it within the flowering plants and the milkweed family.

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

Botanical Nomenclature and Synonyms

The scientific name of Quebracho Blanco is Aspidosperma quebracho-blanco, first described by the botanist Friedrich Anton Wilhelm Miquel in 1864. It is also known by several synonyms, including Aspidosperma quebracho and Aspidosperma blanco, reflecting its widespread use and regional significance in herbal medicine.

Morphological Characteristics

Quebracho Blanco is a tree with a straight, cylindrical trunk and a broad crown. Its root system is deep and extensive, anchoring the plant firmly. The stem is smooth, grayish-brown, and has a distinctive flaky texture. Leaves are alternate, simple, and elliptical with a pointed tip. The inflorescence is a panicle, bearing small, clustered flowers. Flowers are yellow-green with five petals. The fruit is a capsule that splits open to release winged seeds.

Diagnostic Identification Features

Quebracho Blanco can be distinguished by its pale to dark brown, fissured bark, opposite leaf arrangement, and yellowish to orange flowers. It differs from similar species like Aspidosperma quebracho-blanco by its unique bark texture and leaf shape, which are more elongated and narrower compared to related species. The fruit is also distinctive, being a capsule with three valves.

Natural Habitat and Geographic Distribution

Quebracho Blanco is native to South America, primarily found in Argentina, Uruguay, and Paraguay. It thrives in temperate climates with well-defined seasons. It prefers deep, fertile soils with good drainage. It typically grows at altitudes between 500 and 1,500 meters above sea level.

Phenology and Growth Cycle

Quebracho Blanco blooms from September to November, producing yellowish-green flowers. Seed formation occurs between December and March, with mature seeds developing in pods. For identification purposes, the best time to observe key features is during the flowering and seed maturation periods.

Phylogenetic Relationships

Quebracho blanco belongs to the genus Aspidosperma, closely related to species like Aspidosperma pyrifolium and Aspidosperma inebrians. It shares characteristics with other members of the Apocynaceae family, such as milky sap and opposite leaf arrangement, but differs in leaf shape and fruit structure. These traits help distinguish it from related species within the family.