''Tirania purpurea'', the sole species in genus ''Tirania'', is a species of climbing plant

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...

Plants of the World Online Plants of the World Online (POWO) is an online taxonomic database published by the Royal Botanic Gardens, Kew. History Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...

''. Retrieved 26 January 2024. This genus is related to ''

Forchhammeria ''Forchhammeria'' is a genus of plants in the order Brassicales. This genus has previously been placed in the Stixaceae (now obsolete) and Capparaceae, but under the APG IV system is now included in the family Resedaceae. Species can be found in ...

'' and '' Stixis'', but the placement of these three is uncertain. They were placed in

Capparaceae The Capparaceae (or Capparidaceae), commonly known as the caper family, are a family of plants in the order Brassicales. As currently circumscribed, the family contains 15 genera and about 430 species. The largest genera are ''Capparis'' (about 1 ...

until DNA studies showed them to be more closely related to

Resedaceae Resedaceae is a family of mostly herbaceous dicotyledonous plants comprising 107 known species in 8 to 12 genera. 11 genera are currently accepted:

that to Capparaceae. They are sometimes placed in their own family

Stixaceae Stixaceae is a family in the plant order Brassicales. It is no longer recognised by most taxonomists. The three genera formerly included in Stixaceae — ''Forchhammeria'', ''Stixis (plant), Stixis'' and ''Tirania'' — have sometimes been placed in ...

, but since it is not yet clear whether they are from a clade, they are better left in

Brassicales The Brassicales (or Cruciales) are an order (biology), order of flowering plants, belonging to the malvid group of eudicotyledons under the APG IV system. Well-known members of Brassicales include cabbage, cauliflower, Brussels sprout, broccoli, ...

unplaced at family rank.

References

Endemic flora of Vietnam Monotypic Brassicales genera Resedaceae Plants described in 1887 Taxa named by Jean Baptiste Louis Pierre {{Brassicales-stub