Isocarpha
''Isocarpha'' (pearlhead) is a genus of flowering plants in the family Asteraceae. They are native to Mexico, Central America, the West Indies, and northern South America, with the range of one species extending north into the United States. Classification Although it is generally assigned to the tribe Eupatorieae, the flowers are unusual for that tribe. It is believed to have evolved from an ancestor which more closely resembles other Eupatorieae. ; Species * ''Isocarpha atriplicifolia'' (L.) R.Br. ex DC. - Chiapas, Guerrero, Cuba, Hispaniola, Central America, Colombia, Venezuela * ''Isocarpha fistulosa'' Keil & Stuessy - Peru, Ecuador * ''Isocarpha megacephala'' Mattf. - eastern Brazil (Bahia, Pernambuco, Paraíba) * ''Isocarpha microcephala'' (DC.) S.F.Blake - Peru, Ecuador * ''Isocarpha oppositifolia'' (L.) Cass. - Mesoamerica, northern South America, West Indies, extreme southern Texas References

Eupatorieae Asteraceae genera {{Eupatorieae-stub ...
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Isocarpha Oppositifolia
''Isocarpha oppositifolia'', the Rio Grande pearlhead, is a New World species of plants in the family Asteraceae. It is widely distributed in eastern and southern Mexico, Central America, the West Indies (Cuba, Jamaica, Bahamas, Caymans, Trinidad), and northern South America (Colombia, Venezuela). The range extends northward, just barely crossing to the north side of the Río Grande in the two southernmost counties in Texas (Cameron County, Texas, Cameron + Hidalgo County, Texas, Hidalgo).David J. Keil & Tod F. Stuessy. 1981. Systematics of ''Isocarpha'' (Compositae: Eupatorieae). Systematic Botany (1981) 6(3): pp. 258-287
descriptions, line drawings, distribution maps for all 5 s ...
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