by Stephen Mifsud
   7 Dec 2023      ()
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Erigeron canadensis   (Canadian Horseweed)

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

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Profile Date Mar-2012 (taxon update: Sep-2022)
Citation for this page Mifsud, S. (2022). Erigeron canadensis - datasheet created on Mar-2012. Retrieved from on 07-Dec-2023

Nomenclature and Basic Information

Species name :

Erigeron canadensisL.
Published in Bull. Torrey Bot. Club 70: 632 (1943)

Synonyms :
(basionym or principal syn.)

Conyza canadensis (L.) Cronquist
Full list of synonyms : [Euro+Med] [PlantList] [IPNI] [POWO] [Catalogue of Life] []

Plant Family :

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

English name(s) :

Canadian Horseweed, Canadian Fleabane

Maltese name(s) :

Żagħżigħa Kanadiża

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 ( annual plants, herbaceous )
Germination [info]: Dicotyledon

Legal Protection :

Not legally protected till the last update of this website (2/Mar/2022)

Red List (1989) :

Not listed in the Red Data Book of the Maltese Islands

Flowering Time :

September – December

Colour of Flowers:

Green or Inconspicuous


Not particularly toxic

Name Derivation :

canadensis: From or related to Canada. (Latin origin )

Planting in rural areas :

Can be planted in rural areas according to ERA Guidelines

Description, Habitat and Distribution
Habitat in Europe: Cultivated ground and waste places.
Preferred habitat in Malta: Arid wasteground and abandoned places in urban areas.
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: 2n=18
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.
(from Euro+Med Checklist, 2019)
  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)]

Links & Further literature (0 papers)

Google Web

Google Images

Google Scholar

Research Gate




Med Checklist

Cat. of Life



World Flora Online

Plants of the World Online

Vienna Virt. Herb.

RBGE Herbarium

KEW Herbarium




Kindly Email if there are papers and publications about local studies or information about this species to be included in the list above.

Species Images (6 images)
   Erigeron canadensis   -   Image Code: EGRCA-0.
   Erigeron canadensis   -   Image Code: EGRCA-1.
   Erigeron canadensis   -   Image Code: EGRCA-2.
   Erigeron canadensis   -   Image Code: EGRCA-3.
   Erigeron canadensis   -   Image Code: EGRCA-4.
   Erigeron canadensis   -   Image Code: EGRCA-5.

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