Conyza ramosissima (dwarf horseweed) is a species of North American plants in the daisy family. It is widespread and common across the central part of the United States, its range extending from New Mexico east to Alabama and north as far as Pennsylvania, Ontario, and North Dakota. The oldest name for the species is Erigeron divaricatus, coined in 1803 and still used by some sources. Moving the species to Conyza required a change in epithet to avoid a conflict with the name Conyza divaricata Spreng., used for a South American plant in 1826. Hence the new name Conyza ramosissima.