Barkleyanthus

 ( Senecioneae ) 

Barkleyanthus is a monotypic taxonde Vivar, A. R., et al. (2007). Secondary metabolites from Mexican species of the tribe Senecioneae (Asteraceae). Revista de la Sociedad Química de México 51(3), 160-72. of in the aster family, Asteraceae, containing the single species Barkleyanthus salicifolius, a plant formerly classified in the genus Senecio. Barkleyanthus salicifolius. Flora of North America. Barkleyanthus salicifolius. Integrated Taxonomic Information System (ITIS). It is native to North America and Central America, where its distribution extends from the southwestern United States to El Salvador. Its common names include willow ragwort, willow groundsel, Barkley's-ragwort, Barkleyanthus salicifolius. NatureServe. 2013. and jarilla.

This plant is a shrub producing a branching stem usually about one to two meters tall, but known to exceed 4 meters at times. The leaves are roughly lance-shaped and are alternately arranged, sometimes more densely toward the ends of branches. They are up to 10 or 15 centimeters long. The inflorescence is often a wide array of several pseudanthium, but they may also be clustered in the leaf axils or branch tips. The head contains a few yellow ray florets, which are gynoecium, and up to 25 or more yellow disc florets, which are bisexual. The fruit is a rough-textured, pyramidal or prism-shaped cypsela up to a centimeter long including its pappus of many barbed white bristles.

This plant is abundant in parts of its range, particularly in Mexico, sometimes becoming . It flowers year-round, especially in spring, and it may be in full flower at the end of the dry season. It is admired for its yellow flower heads and is cultivated as an ornamental plant.

The plant is used in Mexican traditional medicine to treat fever and rheumatism.González, C. P., et al. (2013). Anti-inflammatory activity and composition of Senecio salignus Kunth. BioMed Research International 2013. In Chiapas it is used as an insecticide in maize supplies. Secondary metabolites isolated from the species include pyrrolizidine alkaloids, , , and .