Tragia is a genus of more than 150 species of flowering plants in the spurge family, Euphorbiaceae, placed in the order Malpighiales. The genus was described by Charles Plumier and formally published by Carl Linnaeus in Species Plantarum in 1753 (Plum. ex L.). Plants in the genus are commonly known as noseburns, a name that alludes to the irritating, stinging hairs found on many species.
The genus has a remarkably broad distribution, occurring across North and South America, Africa, the Arabian Peninsula, the Indian subcontinent, northern Australia, and numerous islands in the Caribbean and the Indian Ocean. Members of the genus are typically herbaceous or shrubby plants bearing stinging trichomes, a characteristic that unites most of the group and gives rise to the common name.
Tragia has historically encompassed a larger number of species, many of which have since been transferred to related genera including Acalypha, Dalechampia, Plukenetia, and others. The GBIF backbone currently recognises around 209 descendants. Approximately 25 species have documented medicinal uses, particularly within the Siddha medicine tradition practised by Tamil communities, where preparations from these plants are used to treat eczema, fevers, wheezing, and diabetes.
Etymology
The common name "noseburns" refers to the stinging hairs (trichomes) characteristic of many species in the genus, which cause a burning sensation on contact. The genus name Tragia honours the German botanist and physician Hieronymus Bock (1498–1554), who published under the Latinised name Tragus.
Distribution
Tragia is widespread across tropical and subtropical regions of the world, including North and South America, Africa, the Arabian Peninsula, the Indian subcontinent, northern Australia, and islands in the Caribbean and Indian Ocean.
Cultural Uses
Around 25 species of Tragia have documented medicinal properties, showing antibacterial, antifungal, and antiproliferative activity in studies. These species are used in Siddha medicine, the traditional system practised by Tamil communities, to treat conditions including eczema, fevers, wheezing, and diabetes.
Taxonomy Notes
The genus Tragia was described by Charles Plumier and published by Linnaeus in 1753. Historically it included many more species; numerous taxa have since been transferred to related genera such as Acalypha, Dalechampia, Plukenetia, Micrococca, Cnesmone, Omphalea, and others. The GBIF backbone currently recognises approximately 209 accepted descendants.
