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''Tribeles australis'', the sole species in the genus ''Tribeles'', is a
prostrate shrub A prostrate shrub is a woody plant, most of the branches of which lie upon or just above the ground, rather than being held erect as are the branches of most trees and shrubs. Background Prostration may occur because the supporting tissues in ste ...
native to
Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...
and
Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...
.


Taxonomy

Historically it was placed alone in family Tribelaceae. This was placed in the Hydrangeales by Takhtajan, but the
APG II system The APG II system (Angiosperm Phylogeny Group 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 Gro ...
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 is a family of flowering plants consisting of about 130 species in seven genera. In the APG II system it is one of eight families in the euasterids II clade (campanulids) that are unplaced as to order. More recent research has prov ...
, so the
Angiosperm Phylogeny Website The Angiosperm Phylogeny Website (or APweb) is a website dedicated to research on angiosperm phylogeny and taxonomy. The site is hosted by the Missouri Botanical Garden website and maintained by researchers, Peter F. Stevens and Hilary M. Davis ...
recommends placing it there, and treating Tribelaceae as a synonym of Escalloniaceae.


References

Escalloniaceae Monotypic asterid genera Flora of Argentina Flora of Chile {{Asterid-stub