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Conyza canadensis, Erigeron canadensis,
Horseweed, Canadian Horseweed, Canadian Fleabane

Scientific name:  Conyza canadensis (L.) Cronquist
Synonym name:  Erigeron canadensis L.
Common name:  Horseweed, Canadian Horseweed, Canadian Fleabane
Plant Family:  Compositae / Asteraceae, Aster Family

Conyza canadensis, Erigeron canadensis, Canadian Horseweed, Canadian Fleabane

Life form:  Annual
Stems:  Erect, main stem branches only in the upper half; lateral stems shorter than the central stem
Leaves:  Alternate, entire, glabrous to densely covered with short stiff hairs
Inflorescence:  loose panicle
Flowers:  Whitish flower heads that consist of 7-13 disk flowers surrounde by 20-40 ray flowers with ligules; phyllary midveins brown, conspicuously filled with raisin, glabrous to hairy
Fruits / pods:  Achenes; pappus bristles mostly 2.5-3mm long, dirty white
Flowering Period:  June, July, August, September
Habitat:  Cultivated areas (weeds), Disturbed habitats

Conyza canadensis, Erigeron canadensis, Canadian Horseweed, Canadian Fleabane


Derivation of the botanical name:
Conyza, konops (Greek), "a gnat", and used by Pliny as a name for some kind of a fleabane, or konis (Greek), "dust", its powder being used to kill fleas.
canadensis, referring to Canada.
Erigeron, Greek, er, spring; geron, an old man; suggested by the hoariness of some vernal species.
  • The standard author abbreviation L. is used to indicate Carl Linnaeus (1707 – 1778), a Swedish botanist, physician, and zoologist, the father of modern taxonomy.
  • The standard author abbreviation Cronquist is used to indicate Arthur John Cronquist (1919 – 1992), a North American botanist and a specialist on Compositae.

Conyza canadensis, Erigeron canadensis, Canadian Horseweed, Canadian Fleabane


 
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