[Members of the Sunflower Family East of the Cascade Mts. with Flower Heads like Daisies]
Horseweed, Canada Fleabane
Synonyms: Conyza canadensis var. canadensis, Conyza canadensis var. glabrata, Erigeron canadensis
The photograph above shows a view of horseweed as seen in disturbed soils alongside the old higway about one mile east of Celilo, OR...........September 1, 2007.
The photo above shows a view down onto the tiny ring of white ray flowers as well as the yellow disk flowers of horseweed. Photographed about one mile east of Celilo, OR..........September 1, 2007.
The photo above shows the involucre as well as the tips of the tiny ray flowers of horseweed. There are a few minute hairs on the involucral bracts, but they are essentially glabrous. The similar Conyza bonariensis is more copiously haired on the involucre. Photographed along the old highway about one mile east of Celilo, OR.........September 1, 2007.
The photo above shows a close-up of the numerous narrow stem leaves of horseweed.........September 1, 2007.