[Members of the Sunflower Family Having Daisy-like Flower Heads Found West of the Cascade Mountains]

Horseweeds West of the Cascade Mountains of Oregon and Washington

The Genus Conyza

Horseweed, Canada Fleabane, Canadian Fleabane: Conyza canadensis (Synonyms: Conyza canadensis var. canadensis, Conyza canadensis var. glabrata, Erigeron canadensis) - Horseweed, Canada Fleabane, Canadian Fleabane: Conyza canadensis (Synonyms: Conyza canadensis var. canadensis, Conyza canadensis var. glabrata, Erigeron canadensis)

Canadian horseweed as seen in disturbed soils alongside old Higway 30 about one mile east of Celilo, OR........September 1, 2007.

Flax-leaved Horseweed, South American Conyza, South American Horseweed: Conyza bonariensis (Synonym: Conyza floribunda) - Introduced from South America.

Canadian Fleabane, Canadian Horseweed, Horseweed: Conyza canadensis (Synonyms: Conyza canadensis var. canadensis, Conyza canadensis var. glabrata, Conyza canadensis var. sumatrensis, Erigeron canadensis) - Native.

Paul Slichter E-mail