Joannesia is a genus of plants in the family Euphorbiaceae, first described as a genus in 1798.Vellozo, José Mariano da Conceição. 1798. Alographia dos alkalis fixos: vegetal ou potassa, mineral ou soda e dos sus nitratos: segundo as melhores memorias estrangeiras, que se tem escripto a este asumpto 199.Tropicos, Joannesia Vell. The entire genus is endemic to Brazil.Kew World Checklist of Selected Plant FamiliesForzza, R. C. 2010. Lista de espécies Flora do Brasil . Jardim Botânico do Rio de Janeiro, Rio de Janeiro
Etymology Joannesia is a taxonomic patronym honoring the king John VI of Portugal.
The name Joannesia yielded a taxonomic anagram for the confamilial genus Annesijoa.
Systematics Species Joannesia heveoides Ducke – Amazonas State in Brazil Joannesia princeps Vell. – eastern Brazil (Distrito Federal, Espírito Santo, Minas Gerais, Rio de Janeiro)
Species in homonymic genus In 1807, Persoon used the same name, Joannesia, to a very different plant.Persoon, Christiaan Hendrik. 1807. Synopsis Plantarum 2: 383 in Latin 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:Tropicos, Joannesia Pers. Joannesia insignis Pers. – Chuquiraga jussieui J.F.Gmel.The Plant List, synonym list for Chuquiraga jussieui J.F.Gmel.
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