Conyza

Conyza
Conyza bonariensis
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Astereae
Genus:	Conyza Less., 1832
Species
See text

Conyza bonariensis seed heads and flowers

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 genus is 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 Monsanto herbicide Roundup, in some cases.^[1]

Selected species

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

• Conyza aegyptiaca. Africa, southern Asia.
• Conyza ageratoides. Madagascar.
• Conyza blinii. China.
• Conyza bonariensis. Pantropical.
• Conyza canadensis. North and Central America.
• Conyza japonica. Eastern Asia.
• Conyza laevigata. Mexico, Central and South America
• Conyza leucantha. Southern Asia, northern Australia.
• Conyza muliensis. China.
• Conyza perennis. China.
• Conyza stricta. China.
• Conyza primulifolia. Mexico, Central and South America
• Conyza sumatrensis. South America (not Sumatra)

References and external links

1. ^ Zelaya, I. A. (2007), "Transfer of glyphosate resistance: evidence of hybridization in Conyza (Asteraceae)", American Journal of Botany 94: 660, doi:10.3732/ajb.94.4.660 

• Germplasm Resources Information Network: Conyza
• Chinese plant names: Conyza

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