Sigesbeckia is a genus of annual flowering plants in the family Asteraceae (the daisy family), within the order Asterales. The genus has a pantropical distribution and extends into temperate regions of Asia and South America. Plants in this genus are commonly known as St. Paul's wort.
The genus comprises a small number of species — most notably Sigesbeckia orientalis, S. pubescens, and S. glabrescens — that have long been used in traditional medicine across Asia. All three species are annual herbs whose aerial parts are harvested for medicinal preparations. Royal Botanic Gardens, Kew, treats S. pubescens as a subspecies of S. orientalis.
Sigesbeckia is best known for its role in traditional Chinese medicine, where the preparation known as xi xian cao ("dispel wind-dampness") has been documented in the Chinese materia medica since at least 659 AD. The genus is widely studied for its potential in managing chronic inflammatory and rheumatic conditions, including arthritis, joint pain, muscle pain, and sciatica.
Distribution
Sigesbeckia has a pantropical distribution, with its range also extending into temperate zones of Asia and South America. Individual species are found across tropical Africa, Asia, and the Americas.
Cultural Uses
Sigesbeckia species have been used in traditional medicine for at least 1,400 years. The Chinese preparation xi xian cao — documented in Chinese materia medica from 659 AD — is derived from the aerial parts of the plant and used to "dispel wind-dampness, strengthen sinews, and relieve wind-heat-damp pain obstructions." Conditions treated include arthritis, joint pain, muscle pain, sciatica, and hypertension.
Taxonomy Notes
The genus comprises a small number of accepted species. Royal Botanic Gardens, Kew, treats Sigesbeckia pubescens as a subspecies of S. orientalis rather than a separate species, reducing the commonly cited three medicinal taxa to two accepted species.
