''Joannesia'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of plants in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Euphorbiaceae Euphorbiaceae, the spurge family, is a large family of flowering plants. In English, they are also commonly called euphorbias, which is also the name of a genus in the family. Most spurges, such as ''Euphorbia paralias'', are herbs, but some, e ...

, first described as a genus in 1798. The entire genus is

endemic Endemism is the state of a species being found 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 found elsew ...

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

.Kew World Checklist of Selected Plant Families
/ref>

Etymology

''Joannesia'' is a taxonomic patronym honoring the king

John VI of Portugal , house = Braganza , father = Peter III of Portugal , mother = Maria I of Portugal , birth_date = , birth_place = Queluz Palace, Queluz, Portugal , death_date = , death_place = Bemposta Palace, Lisbon, Portugal , ...

. The name ''Joannesia'' yielded a taxonomic anagram for the confamilial genus ''

Annesijoa ''Annesijoa'' is a monotypic genus of plants in the family Euphorbiaceae. The sole species, ''Annesijoa novoguineensis'' is endemic to New Guinea. Etymology ''Annesijoa'' is a taxonomic anagram derived from the name of the confamilial genus '' ...

''.

Systematics

;Species # '' Joannesia heveoides'' Ducke - Amazonas State in Brazil # '' Joannesia princeps'' Vell. - eastern Brazil (

Distrito Federal A federal district is a type of administrative division of a federation, usually under the direct control of a federal government and organized sometimes with a single municipal body. Federal districts often include capital districts, and they e ...

Espírito Santo Espírito Santo (, , ; ) is a state in southeastern Brazil. Its capital is Vitória, and its largest city is Serra. With an extensive coastline, the state hosts some of the country's main ports, and its beaches are significant tourist attra ...

Minas Gerais Minas Gerais () is a state in Southeastern Brazil. It ranks as the second most populous, the third by gross domestic product (GDP), and the fourth largest by area in the country. The state's capital and largest city, Belo Horizonte (literally ...

Rio de Janeiro Rio de Janeiro ( , , ; literally 'River of January'), or simply Rio, is the capital of the state of the same name, Brazil's third-most populous state, and the second-most populous city in Brazil, after São Paulo. Listed by the GaWC as a b ...

) ;Species in homonymic genus In 1807, Persoon used the same name, ''Joannesia'', to a very different plant. He thus created an illegitimate homonym, contrary to the rules of nomenclature. So the one species name that he had created in this illegitimate genus had to be renamed, as follows: *''Joannesia insignis'' Pers. - ''

Chuquiraga jussieui ''Chuquiraga jussieui'', the flower of the Andes, is a species of flowering plant in the family Asteraceae. It is a low shrub, reaching a height of about 75 cm. ''Chuquiraga jussieui'' is an endangered flower. Flowers are pale yellow or oran ...

'' J.F.Gmel.The Plant List, synonym list for ''Chuquiraga jussieui'' J.F.Gmel.
/ref>

References

Euphorbiaceae genera Jatropheae Endemic flora of Brazil {{Euphorbiaceae-stub