Tribeles australis, the sole species in the genus Tribeles, is a prostrate shrub

Prostrate shrub

A prostrate shrub is a woody plant, most of the branches of which lie upon or just under the ground, rather than being held erect as are the branches of most trees and shrubs....

 native to Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

 and Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

.

Taxonomy

Historically it was placed alone in family Tribelaceae. This was placed in the Hydrangeales by Takhtajan, but the APG II system

APG II system

The APG II system of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Group. It was a revision of the first APG system, published in 1998, and was superseded in 2009...

 placed it in the Euasterids II clade (campanulids) unplaced as to order. More recent work has provided evidence that Tribeles arose from within the ranks of Escalloniaceae

Escalloniaceae

The Escalloniaceae is a family of flowering plants comprising about 130 species in seven genera. In the APG II system it is one of eight families in the euasterids II clade that are unplaced as to order...

, so the Angiosperm Phylogeny Website

Angiosperm Phylogeny Website

Angiosperm Phylogeny Website is a well-known web site dedicated to research on Angiosperm phylogeny and taxonomy.The site is hosted by the Missouri Botanical Garden website and maintained by researcher Peter F. Stevens, who is a member of the Angiosperm Phylogeny Group...

recommends placing it there, and treating Tribelaceae as a synonym of Escalloniaceae.