by Stephen Mifsud
   28 Feb 2020      ()
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Conyza canadensis   (Canadian Horseweed)

Conyza canadensis   (ASTERACEAE.) 
Images for this profile are taken from the Maltese Islands at or after year 2000.

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Profile Date Oct-2010 (last update: 12-Jan-2019)
Citation for this page Mifsud, S. (Oct-2010) Conyza canadensis retrieved from on 2020-Feb-28

Nomenclature and Basic Information

Species name :

Conyza canadensis (L.) Cronquist
Published in Bull. Torrey Bot. Club 70: 632 (1943)

Synonyms :
(basionym or principal syn.)

Erigeron canadensis
Full list of synonyms : [Euro+Med] [PlantList] [IPNI] [POWO] [Catalogue of Life ]

Plant Family :

Asteraceae Bercht. & J.Presl (=Compositae) (The Daisy or Sunflower Family)
125 species from the Asteraceae family are recorded from the Maltese Islands.

English name(s) :

Canadian Horseweed, Canadian Fleabane

Maltese name(s) :

Maltese name not known

Status for Malta :

Doubtful origin. It is not yet established if this species is native or not)

Frequency :

Very Common     Common     [Frequent]     Scarce     Rare     Very rare     Extinct

Growth form :

Raunkiaer lifeform [info]: THEROPHYTE (annuals)
Germination [info]: Dicotyledon

Legal Protection [link]:

Not Protected by Law (LN200/2011 or LN311/2006)

Red List (1989) :

Not listed in the Red Data Book of the Maltese Islands

Flowering Time :


Colour of Flowers:

Green or Inconspicuous

Species Description and Distribution

Habitat in Europe:

Cultivated ground and waste places.

Preferred habitat in Malta:

Data will be available in the next update of this website.

Botanical Description:

Annual 10-150 cm, patent-hirsute. Leaves numerous, narrow, the lower up to 10 x 1 cm, oblanceolate, petiolate, often deciduous, the others linear, at least the upper sessile Capitula less than 1 cm wide, generally numerous, in a long, paniculate inflorescence with a single axis. Involucre 3-4 mm, glabrous or nearly so. Female florets usually 25-45; ligules 0.5-1 mm, equalling or slightly exceeding the style and pappus.

Chromosome number:


Distributional range:

Naturalized almost throughout Europe.

Native region outside Europe:

(North America.)

Distributional map in Europe
and the Mediterranean region (2018):

Occurrences in Europe.
(from Flora Europaea pre year 1993):

Introduced in  All Europe except Faroe Islands, Ireland, Iceland, Russia and former USSR, Svalbard archipelago

Occurrences in Europe and the Mediterranean region.
(Euro+Med Checklist, 2017) - Country codes

[nAb(A N) nAE(G) nAg nAl Ar nAu(A L) Az(C F G J P S) nAz(L M T) nBe(B L) nBH Bl nBl(I M N) nBr nBu By Ca(C T) nCg nCo nCr nCs nCt nCy nDa nEs nFe nGa(C F) nGe Gg nGr aHb(E N) nHe nHo nHs(A G S) nHu nIJ nIr nIt nJu nLa nLe Li nLS nLt nLu nMa nMd(M) nMk Mo nNo nPo Rf(C E N NW S) nRf(CS K) nRm nSa nSi(S) nSk Sl Sn nSr nSu nSy nTcs Tn nTu(A E) nUk(K) Uk(U)]

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Links & Further info

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Med Checklist

Cat. of Life



The Plant List


Vienna Virt. Hb.





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