dcsimg

Description

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Annual or perennial herbs or shrubs. Leaves alternate, entire, toothed or pinnatifid. Capitula heterogamous. Phyllaries in 2-many series, narrowly linear, lanceolate or oblong, the outer smaller. Outer female florets white, sordid, greenish or yellow in 2-many series, fertile, filiform, either bearing rays or minutely 3-4(-5)-lobed or truncate. Disk florets whitish-yellow or greenish, bisexual but often sterile, tube with triangular lobes. Pappus accrescent, with numerous barbellate setae.
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Mark Hyde, Bart Wursten and Petra Ballings
bibliographic citation
Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Conyza Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/genus.php?genus_id=1480
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Mark Hyde
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Bart Wursten
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Petra Ballings
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Flora of Zimbabwe

Conyza

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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]

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Conyza bonariensis seed heads and flowers
Species[3]

References

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

provided by wikipedia EN

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

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.

Many species of the genus Conyza are ruderal species and some have been found to be resistant to the herbicide glyphosate.

" Conyza bonariensis seed heads and flowers Species 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 boranensis (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
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