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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Astereae
Subtribus: Conyzinae
Genus: Conyza
Species: C. abyssinica – – C. agnewii – C. agrostophylla – C. alluaudii – C. amboinica – C. andringitrana – C. androrangensis – C. angustifolia – C. bakeri – C. baumii – C. burmeana – C. clarenceana – C. flabellata – C. garnieri – C. gigantea – C. gouanii – C. incana – C. kahuzica – C. kraussii – C. limosa – C. longipedunculata – C. mandrarensis – C. megensis – C. messeri – C. mixta – C. montigena – C. nana – C. neglecta – C. neocandolleana – C. newii – C. pallidiflora – C. pannosa – C. perrieri – C. pusilla – C. sarmentosa – C. schimperi – C. schlechtendalii – C. semipinnatifida – C. sennii – C. spinellosa – C. spinosa – C. steudelii – C. stricta – C. subscaposa – C. tigrensis – C. timorensis – C. urticifolia – C. variegata – C. viguieri – C. volkensiiC. ageratoides -

Conyza Less., Syn. Gen. Compos. 203. (1832) nom. cons.

Type species: Non designatus Conyza chilensis Spreng., Novi Provent. 14. (1819) transferred to Erigeron chilensis

Note: This is a view of Conyza s.s. and the combinations in the list above have not been formally transferred to Erigeron or other genera. See Discussion Page for more details.

Lessing, C.F. 1832. Synopsis Generum Compositarum Earumque Dispositionis Novae Tentamen Monographiis Multarum Capensium Interjectis... Berolini [Berlin] 203.
Hassler, M. 2018. Conyza. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Mar. 17. Reference page.
International Plant Names Index. 2018. Conyza. Published online. Accessed: Mar. 17 2018. 2018. Conyza. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Mar. 17.
Noyes, R.D. 2000. Biogeographical and evolutionary insights on Erigeron and allies (Asteraceae) from ITS sequence data. Pl. Syst. Evol. 220: 93–114.


USDA, ARS, Germplasm Resources Information Network. Conyza Less. in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 2013-10-30.
Flora of North America: Conyza
Conyza – Taxon details on National Center for Biotechnology Information (NCBI).
EOL: Conyza

Vernacular names
Afrikaans: Skraalhanse
العربية: كونيزة
čeština: turanka
dansk: Bakkestjerne
Deutsch: Berufkräuter, Katzenschweif
English: horseweed, butterweed, fleabane
suomi: Koiransilmät
עברית: קייצת
日本語: イズハハコ属
lietuvių: Konyza
Nederlands: Asterfijnstraal
polski: Konyza
русский: Мелколепестничек
slovenčina: turanec
svenska: Ogräsbinkor
中文: 假蓬属

Conyza (horseweed, butterweed or fleabane) is a genus of flowering plants in the sunflower family.[4][5][6][7]

They are 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).[8]

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.[8]

Many species of the genus Conyza are ruderal species and some have been found to be resistant to the herbicide glyphosate.[9]
Conyza bonariensis seed heads and flowers


Conyza abyssinica Sch.Bip. ex A.Rich.
Conyza adenocarpa Dalzell & A.Gibson
Conyza ageratoides DC.
Conyza agnewii Mesfin
Conyza agrostophylla F.G.Davies
Conyza alluaudii Humbert
Conyza amboinica Crantz
Conyza andina J.Rémy
Conyza andringitrana Humbert
Conyza androrangensis Humbert
Conyza angustifolia Roxb.
Conyza arabidifolia Remy
Conyza arenosa
Conyza atrixioides Chiov.
Conyza attenuata DC.
Conyza attenuata Wall.
Conyza auriculifera R.E.Fr.
Conyza bakeri Humbert
Conyza bampsiana (Lisowski) Lisowski
Conyza baumii (O.Hoffm.) Wild
Conyza blinii H.Lév.
Conyza boelckei Cabrera
Conyza bonariensis (S.Moore) Cufod.
Conyza burkartii Zardini
Conyza burmeana Miq.
Conyza bustillosiana J.Rémy
Conyza canadensis (now Erigeron canadensis)
Conyza capillipes S.Moore
Conyza cardaminifolia Kunth
Conyza catharinensis Cabrera
Conyza chionea S.Díaz & A.Correa
Conyza clarenceana (Hook.f.) Oliv. & Hiern
Conyza collina Phil.
Conyza copiapina Phil.
Conyza cordata Kuntze
Conyza coronopifolia Kunth
Conyza dentonae McVaugh
Conyza depilis Phil.
Conyza deserticola Phil.
Conyza edelbergii Rech.f.
Conyza eucoma Miq.
Conyza fastigiata Willd.
Conyza feae (Bég.) Wild
Conyza flabellata Mesfin
Conyza foliosa Phil.
Conyza fruticulosa O.Hoffm.
Conyza gallianii Chiov.
Conyza garnieri Klatt
Conyza gayana Phil.
Conyza gigantea O.Hoffm.
Conyza glabrata Phil.
Conyza glabrescens Pax
Conyza glandulitecta Cabrera
Conyza gonania
Conyza grahamii DC.
Conyza hirtella DC.
Conyza hochstetteri Sch.Bip. ex A.Rich.
Conyza hypoleuca A.Rich.
Conyza incana (Vahl) Willd.
Conyza japonica (Thunb.) Less. ex Less.
Conyza kahuzica Lisowski
Conyza laevigata (Rich.) Pruski
Conyza larrainiana J.Rémy
Conyza lasseriana Aristeg.
Conyza lateralis Phil.
Conyza leucantha (D.Don) Ludlow & P.H.Raven
Conyza lignescens Rusby
Conyza limosa O.Hoffm.
Conyza longipedunculata Klatt
Conyza lorentzii Griseb.
Conyza loueirii Poir.
Conyza macrophylla Spreng.
Conyza magnimontana Cabrera
Conyza mandrarensis Humbert
Conyza maxima Zoll. & Moritzi
Conyza megensis F.G.Davies
Conyza messeri Pic.Serm.
Conyza microcephala Hemsl.
Conyza mima S.F.Blake
Conyza minutiflora Phil.
Conyza mixta Fouc. & Neyr.
Conyza modesta Kunth
Conyza molleri Phil.
Conyza monorchis (Griseb.) Cabrera
Conyza montigena S.Moore
Conyza muliensis Y.L.Chen
Conyza myriocephala
Conyza nana Sch.Bip. ex Oliv. & Hiern
Conyza neglecta R.E.Fr.
Conyza nemoralis Phil.
Conyza neocandolleana Humbert
Conyza newii Oliv. & Hiern
Conyza obscura DC.
Conyza oligantha Cabrera
Conyza pallidiflora R.E.Fr.
Conyza pampeana (Parodi) Cabrera
Conyza pannosa Webb
Conyza pectinata (Sch.Bip.) Sch.Bip. ex Oliv. & Hiern
Conyza pencana Phil.
Conyza perennis Hand.-Mazz.
Conyza perijaensis S.Díaz & A.Correa
Conyza perrieri Humbert
Conyza pinnata (L.f.) Kuntze
Conyza pinnatifida (Thunb.) Less.
Conyza podocephala DC.
Conyza popayanensis (Hieron.) Pruski
Conyza principis Gagnep.
Conyza procumbens Balb.
Conyza prolialba Cuatrec.
Conyza pterocaulon Bolle
Conyza pulsatilloides O.Hoffm.
Conyza pusilla Houtt.
Conyza pycnophylla Phil.
Conyza pyrrhopappa Sch.Bip. ex A.Rich.
Conyza ramosissima Cronquist
Conyza reitziana Cabrera
Conyza retirensis Cabrera
Conyza ruderalis Phil.
Conyza rufa Wall. ex DC.
Conyza ruwenzoriensis (S.Moore) R.E.Fr.
Conyza saltensis Cabrera
Conyza sarmentosa Humbert
Conyza scabrida DC.
Conyza schimperi Sch.Bip. ex A.Rich.
Conyza schlechtendalii Bolle
Conyza semipinnatifida Wall. ex DC.
Conyza sennii Chiov.
Conyza serrana Cabrera
Conyza setulosa F.Phil. ex Phil.
Conyza spiciformis (Griseb.) Zardini
Conyza spiculosa (Hook. & Arn.) Zardini
Conyza spinellosa Miq.
Conyza spinosa (Sch.Bip.) Sch.Bip. ex Oliv. & Hiern
Conyza stenophylla Phil.
Conyza steudelii Sch.Bip. ex A.Rich.
Conyza subscaposa O.Hoffm.
Conyza subspicata Phil.
Conyza suffruticosa Phil.
Conyza sumatrensis (S.F.Blake) Pruski & G.Sancho
Conyza tenera Phil.
Conyza thermarum Phil.
Conyza thesiifolia Kunth
Conyza tigrensis Oliv. & Hiern
Conyza trihecatactis (S.F.Blake) Cuatrec.
Conyza tunariensis (Kuntze) Zardini
Conyza uliginosa (Benth.) Cuatrec.
Conyza ulmifolia (Burm.f.) Kuntze
Conyza urticifolia (Baker) Humbert
Conyza valdiviana Phil.
Conyza varia (Webb) Wild
Conyza variegata Sch.Bip. ex A.Rich.
Conyza vernonioides (Sch.Bip. ex A.Rich.) Wild
Conyza viguieri Humbert
Conyza viscida
Conyza welwitschii (S.Moore) Wild


Tropicos search for Conyza
Tropicos Conyza argentea Lam.
Flann, C (ed) 2009+ Global Compositae Checklist Archived 2014-11-15 at
Lessing, Christian Friedrich. 1832. Synopsis Generum Compositarum 203–204 in Latin
Tropicos, Conyza Less.
Cronquist, A. 1943. The separation of Erigeron from Conyza. Bull. Torrey Bot. Club 70: 629–632. 1943.
Nesom, G. L. 1990c. Further definition of Conyza (Asteraceae: Astereae). Phytologia 68: 229–233.
Flora of North America, Horseweed, Conyza Lessing
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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