''Athroisma'' is a genus of plants in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae ...

first described as a genus in 1833. It is native to

East Africa East Africa, Eastern Africa, or East of Africa, is the eastern subregion of the African continent. In the United Nations Statistics Division scheme of geographic regions, 10-11-(16*) territories make up Eastern Africa: Due to the histori ...

and

Madagascar Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa ...

. ; SpeciesThe Plant List, genus ''Athroisma''
/ref> ; species of homonym genus William Griffith in 1854 used the same name for a genus of very different plants, thus creating an illegitimate

homonym In linguistics, homonyms are words which are homographs (words that share the same spelling, regardless of pronunciation), or homophones (equivocal words, that share the same pronunciation, regardless of spelling), or both. Using this definition, ...

. The World Checklist categorizes his name as a synonym of the genus ''

Trigonostemon ''Trigonostemon'' is a plant genus of the family Euphorbiaceae and the sole member of its tribe (Trigonostemoneae). It was first described as a genus in 1826.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, ...

, but makes no mention of the two species names he coined.

The Plant List The Plant List was a list of botanical names of species of plants created by the Royal Botanic Gardens, Kew and the Missouri Botanical Garden and launched in 2010. It was intended to be a comprehensive record of all known names of plant species ...

does list the species as unresolved, i.e. of unknown application. The two species names areKew World Checklist of Selected Plant Families, genus ''Athroisma'' Griff.
/ref> * ''Athroisma dentatum'' Griff. - Bay of Bengal * ''Athroisma serratum'' Griff. - Tenasserim region of Myanmar

References

Asteraceae genera Flora of Africa Athroismeae {{Asteroideae-stub