''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 Cameron may refer to: People * Clan Cameron, a Scottish clan * Cameron (given name), a given name (including a list of people with the name) * Cameron (surname), a surname (including a list of people with the name) ;Mononym * Cam'ron (born 197 ...

+ Hidalgo).Biota of North America Program 2014 county distribution map
/ref>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 species ''Isocarpha oppositifolia'' is an herb or subshrub up to tall. Leaves are up to long, usually narrow but sometimes egg-shaped. One plant produces several flower heads, each a long flower stalk, each head with 60-150 disc flowers but no ray flowers.

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in Spanish with photos
Photo of herbarium specimen at Missouri Botanical Garden, collected in Guatemala in 2008
Eupatorieae Flora of Northern America Flora of Southern America Flora of Central America Plants described in 1759 Flora of the Caribbean Flora without expected TNC conservation status {{Eupatorieae-stub