Isocarpha (pearlhead) is a genus of flowering plants in the family Asteraceae.Brown, Robert. 1817. Observations on the Natural Family of Plants called Compositae 110Tropicos, Isocarpha R. Br. 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.Weberling, F. H. E. & J. A. Lagos. 1960. Neue Blütenpflanzen für El Salvador - C.A. (Vorläufige Liste). Beitrage zur Biologie der Pflanzen 35(2): 177–201Turner, B. L. 1997. The Comps of Mexico: A systematic account of the family Asteraceae, vol. 1 – Eupatorieae. Phytologia Memoirs 11: i–iv, 1–272Keil, D. J. and T. F. Stuessy. 1981. Systematics of Isocarpha (Compositae: Eupatorieae). Systematic Botany 6: 258–287.
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 TexasBiota of North America Program 2013 county range map
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