Flaveria trinervia is a species of flowering plant in the family Asteraceae known by the common names clustered yellowtops,[2] speedyweed,[2] and yellow twinstem.

[2] It is native to parts of the Americas, including the southeastern and southwestern United States (Florida, Texas, Arizona, New Mexico),[3] most of the Bahamas, Mexico, Belize, and parts of the Caribbean,[4] especially Cuba, Cayman Islands, Jamaica, Hispaniola, Puerto Rico and Barbados.

The lance-shaped to oval leaves are each up to 15 centimeters (8 inches) long and arranged oppositely in pairs around the stem, their bases sometimes fused together.

Phototoxic secondary metabolites have been found in the flower head of (Asteraceae) Flaveria trinervia and bark of Simira salvadorensis.

[9] The Australian species F. australasica is very similar and possibly closely related to F. trinervia.