Minnesota Seasons - Canadian horseweed


Canadian horseweed				More photos…
Conyza canadensis

Taxonomy	Family:	Asteraceae (aster)
	Subfamily:	Asteroideae
	Supertribe:	Asterodae
	Tribe:	Astereae (aster)
	No Rank:	North American clade

Nativity	Native
Status
Habitat	Disturbed sites. Fields, roadsides, empty lots.
Flowering	July to October
Flower Color	White ray flowers, yellow disk flowers
Height	12″ to 60″

Identification	The stem is unbranched below the inflorescence. The leaves are linear and crowded on the stem.

Similar Species	When not in flower, the linear leaves are enough to identify this as Canadian horseweed and not a goldenrod.

Range			Sources: 2, 3, 5, 7.

Sightings	Afton State Park Agassiz Dunes SNA Blue Mounds State Park Cedar Mountain SNA Chippewa Prairie Clear Lake SNA Cottonwood River Prairie SNA Crow Wing State Park Crow-Hassan Park Reserve Elm Creek Park Reserve Flandrau State Park Grey Cloud Dunes SNA Iron Horse Prairie SNA Joseph A. Tauer Prairie SNA Kellogg-Weaver Dunes SNA Kellogg-Weaver Unit Lake Bronson State Park Lake Rebecca Park Reserve Lost Valley Prairie SNA Louisville Swamp			Mille Lacs Kathio State Park Mound Spring Prairie SNA Old Mill State Park Ordway Prairie Osmundson Prairie SNA Pin Oak Prairie SNA Pine Bend Bluffs SNA Racine Prairie SNA Rice Lake Savanna SNA River Terrace Prairie SNA Rock Ridge Prairie SNA Spring Creek Prairie SNA Staffanson Prairie Uncas Dunes SNA Wild River State Park

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Habitat

Plant

Inflorescence

Synonyms	Conyza canadensis var. canadensis Erigeron canadensis Leptilon canadense

Common Names	butterweed Canada horseweed Canadian fleabane Canadian hogweed Canadian horseweed fleabane horseweed horseweed fleabane mares tail marestail