Conyza (horseweed, butterweed or fleabane) is a genus of flowering plants in the family Asteraceae.

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).

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.

; Species

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

References

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