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Not to be confused with Cichorium intybus - more commonly called "chicory", but also sometimes called "horseweed"
Conyza bonariensis.jpg
Conyza bonariensis
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Astereae
Genus: Conyza
Less., 1832

See text

Conyza (horseweed, butterweed or fleabane) is a genus of about 50 species of flowering plants in the family Asteraceae, native to tropical and warm temperate regions throughout the world, and also north into cool temperate regions in North America and eastern Asia. The New World species of the genus are closely related to Erigeron (also known as fleabanes).

The species are annual or perennial herbaceous plants, rarely shrubs, growing to 1-2 m tall. The stems are erect, branched, with alternate leaves. The flowers are produced in inflorescences, with several inflorescences loosely clustered on each stem.

Many plant species of the Conyza genus are ruderal species and some have been found to be resistant to the herbicide glyphosate, in some cases.[1]

Conyza bonariensis seed heads and flowers

Selected species[edit]

The native range of each species is given; some are introduced elsewhere in the world.


  1. ^ Zelaya, I. A.; Owen, M. D. K.; Vangessel, M. J. (2007), "Transfer of glyphosate resistance: evidence of hybridization in Conyza (Asteraceae)", American Journal of Botany 94 (4): 660–73, doi:10.3732/ajb.94.4.660, PMID 21636434 

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